Costco Promo Codes in September 2026
Save with our selected list of working Costco coupons today
Meet your expert
As a savings expert, Costco’s weekly sales and price cuts always catch my attention. Hi, I’m Pat, an editor at Coupons.com since 2021. I add the deals and savings tips you’ll find on this page. I also hand-test and verify every code, and I work with the Costco affiliate team to help shoppers find strong discounts on everyday purchases.
My top advice is to check Costco’s Treasure Hunt section. It features member-only pricing and limited-time sales. I’ve found savings of up to $1,000 on electronics and furniture there.
About Costco
Costco is a membership-only warehouse store known for low prices on brand-name merchandise. They started in 1976 and today have more than 800 warehouse locations worldwide. Costco sells a wide range of products. These include groceries, electronics, appliances, furniture, housewares, and office supplies. Members can also shop Kirkland Signature products, Costco's private label brand.
Have questions about products, sales, returns, or Costco promo codes? Start with the General FAQs section on the customer service page. To speak to a representative about membership and warehouse orders, call 1-800-774-2678, Monday to Friday, from 6 a.m. to 6 p.m. PT, and weekends from 8 a.m. to 5 p.m. PT. For online purchases, call 1-800-955-2292, Monday to Friday, from 5 a.m. to 8 p.m. PT, and weekends from 5 a.m. to 7 p.m. PT.
Costco’s return policy
Costco has a return policy that offers members a 100% satisfaction guarantee on membership and merchandise. If dissatisfied with your Costco membership, they will refund your membership fees at any time. Most merchandise is also refundable, though exceptions apply. These items have a 90-day return window from the date of receipt:
TVs and projectors
Computers and touchscreen tablets
Smart wearables
Cameras, drones, and camcorders
MP3 players and cellphones
Major appliances, such as refrigerators, freezers, dishwashers, washers, and dryers
Recreational carts ordered online
These items are non-refundable or restricted:
Airline and live performance event items
Precious metals
Shop Cards
Gift cards and ticket items
Cigarettes and alcohol where prohibited by law
Custom products made to a member’s specifications
Some items have special return instructions. Diamonds over 1.00 carat require original paperwork, and cellphone returns may vary by carrier contract. Hearing aids, contact lenses, eyeglasses, freight-delivered items, tires, and batteries may also have separate return or warranty terms.
Warehouse purchases must be returned at a Costco warehouse. Online orders can be returned at any Costco warehouse or through Costco.com.
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6 active offers1 offer added yesterday
Best Offer
$500 OFF
Get Up to $500 Off $2499+ Spend
Ends in 2 days
Stretch your budget further with up to $500 off qualifying Costco purchases of $2,499 or more. This offer applies to eligible merchandise meeting the minimum spend requirement, subject to applicable exclusions and promotional restrictions. Product selection, savings amounts, and availability may vary.
$400 OFF
Enjoy Up to $400 Off KitchenAid Dishwashers
Ends in 3 days
Cut costs on qualifying KitchenAid dishwashers at Costco with savings of up to $400. This offer applies to select KitchenAid dishwasher models included in the promotion. Product selection, pricing, and availability may vary, and applicable exclusions or promotional restrictions may apply.
Verified
$300 OFF
Save Up to $300 Select Microsoft Surface Laptops
Ends in 2 days
No coupon required. This offer is good while supplies last.
$1500 OFF
Get Up to $1,500 Off Select LG Appliances
Ends in 3 days
Furnish your home with up to $1,500 in savings on select LG appliances at Costco. This offer applies to qualifying refrigerators, ovens, dishwashers, washers, dryers, and other eligible LG appliances. Product selection, pricing, availability, membership requirements, and applicable exclusions or promotional restrictions may vary.
$60 OFF
Save Up to $60 on $200+ P&G Products with Card
Ends in 7 days
Maximize your savings on qualifying P&G products at Costco with up to $60 off when you spend $200 or more using an eligible card. This offer applies to select participating P&G merchandise meeting the minimum purchase requirement. Product selection and availability may vary, and applicable exclusions or promotional restrictions may apply.
Last clicked 5 hours ago
FREE CARD
Free Up to $40 Digital Costco Shop Card with Friend Referral Program
Ends today
Refer a friend to Costco and receive a Digital Costco Shop Card worth up to $40 when your referral leads to an eligible membership purchase. The reward amount depends on the membership selected and applicable referral terms. Referrals must meet Costco’s eligibility requirements to qualify. Rewards are subject to verification and availability. All changes to the referral program are at Costco’s discretion.
Missed these coupons?
Our team has found the below offers to no longer be valid
$800 OFF
Enjoy Up to $800 Off Whirlpool Major AppliancesUpgrade your home with up to $800 off qualifying Whirlpool major appliances at Costco. This offer applies to select refrigerators, ranges, dishwashers, laundry appliances, and other participating Whirlpool products. Product selection, pricing, availability, membership requirements, and applicable exclusions or promotional restrictions may vary.
$700 OFF
Up to $700 Off Mattress Deals During Labor Day SaleSave on top-brand mattresses and mattress sets from Purple, Tempur-Pedic, Stearns & Foster, Sealy Posturepedic, Sleep Science, and more during Costco's Labor Day Sale.
Most online instant savings at Costco.com are manufacturer's savings, which will automatically be applied at checkout. See specific product page for promotion valid dates. State sales tax may be due on the pre-discounted price of the item. These taxes, if any, are in addition to the amount that you are paying for the product. Mattress sale ends 9/9/2026.
$200 OFF
Extra $200 Off $1499+ Select AppliancesUpgrade your kitchen with an extra $200 off select appliances on orders of $1499 or more at Costco. Online only. Limit one per membership. This offer applies to a range of major brands, including refrigerators, ranges, and dishwashers. The discount is applied automatically at checkout on qualifying purchases. This offer may not be combined with other promotions or applied to taxes, shipping charges, or excluded items, and availability is subject to product selection, inventory, and promotional terms. Costco may modify or end this promotion at its discretion.
Frequently asked questions about Costco
Get Costco emails for member deals and seasonal sales
Sign up for Costco's email newsletter for the latest offers and upcoming promotions. You'll find members-only discounts, limited-time deals, and seasonal sale alerts. In August 2026 emails, we've seen them promoting a "Spend & Save" offer on appliances. For example, you spend $1499 or more and get an extra $200 off. Spend $1999 or more for an extra $300 off. Or spend $2499 or more and receive an extra $500 off.
Costco tends to email new sitewide savings at the start of each month, and they also send early details before bigger sales go live. That includes their Labor Day mattress sale, which is live now and runs through September 9. If a new mattress is on your list of things to buy, they have top brands like Tempur-Pedic, Novaform, Purple, Sleep Number, Stearns & Foster, and more for up to $700 off.
Membership perks
A Costco membership gives shoppers access to warehouse pricing, members-only promotions, grocery delivery options, and discounted Costco services.
Gold Star Membership ($65/year) is best for most households that want Costco’s standard in-store and online savings. It includes:
Access to shop in Costco warehouses and online
Members-only pricing and promotions
One free household card
Executive Membership ($130/year) is best for frequent Costco shoppers who spend enough each year to offset the higher fee. It includes all Gold Star benefits, plus:
An annual 2% reward on eligible purchases, up to $1,250
Extra benefits on select Costco services
Additional value for higher-spending households
How to apply a Costco promo code
Follow these steps to apply a Costco promo code at checkout:
Sign in to your Costco account and add your items to the cart.
Click the cart icon in the top right, then select "Checkout."
Enter your promo code in the designated field.
Click "Apply" to update your order.
Elevate your Costco shopping experience and savings
Browse limited-time deals in the Savings section
Costco highlights limited-time online deals in their Savings section. You can browse discounts across categories like beauty, baby, and furniture. Offers vary, but recent examples from August 2026 include:
$700 off a Thomasville modular sectional
Up to $600 off select laptops from Alienware, Dell, HP, and Lenovo
Up to $2,000 off zero gravity massage chairs
$20 off when you buy five to nine apparel items, or $50 off when you buy 10 or more
Rack up $500 in savings from ongoing sales
Costco regularly features online sales across categories like fitness equipment, TVs, and home appliances. Offers vary, but discounts on big-ticket items can range from about $250 to $500. Check Costco’s homepage and sale sections for current promotions and shipping details.
App-only Costco coupons offer extra savings at checkout
Check the Costco mobile app before you shop. Eligible digital coupons are automatically applied when your membership card is scanned at checkout. App-only offers may be available on groceries, household essentials, and electronics. These coupons are most useful for planned purchases and repeat buys when matching offers are available. Save the coupons you want in the app, and then scan your membership card at checkout.
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