Anyone who keeps a running grocery list at Costco Wholesale know that the difference between a $90 cart and a $60 cart often comes down to whether or not you took thirty seconds to clip the right coupon. This week, Costco Wholesale (HQ: Issaquah, WA, roughly 600 US locations) is running a 6% off promotion on Blueberry Muffins (4-pack) as part of its bakery program. The offer is published as a bogo offer valid through 2026-05-10.
Blueberry Muffins (4-pack) is one of the more frequently restocked items in the bakery aisle, which is why Costco Wholesale has chosen it as a featured promotion: shoppers who buy it once tend to buy it again on the same trip the following week. The 6% discount in this campaign is meaningful because it lands above the typical 8–12% promotional band most chains run on their everyday staples. There is no minimum purchase requirement on this offer. Use promo code BAGBLUE63 at checkout — the code is case-insensitive and works at the register, in the mobile app, and on most curbside pickup orders.
Clip the digital coupon inside the retailer's mobile app and link it to the payment method you plan to use that day. If you shop in person, double-check the printed receipt before leaving the store; on rare occasions a bogo offer will fail to scan because of an outdated SKU at a single location, and the customer service desk can apply the discount manually within minutes.
Check the per-ounce price against the store-brand equivalent before you commit — coupons sometimes only beat private label by pennies. Many Costco Wholesale shoppers report saving an additional 8–20% on top of the headline discount by combining this coupon with their loyalty program's earned points or fuel rewards. Because Blueberry Muffins (4-pack) is shelf-stable for at least a few weeks at typical pantry conditions, this is also a reasonable item to stock up on while the discount is live — just be honest about how much your household actually uses week to week.
Fine print: Limit one coupon per household per transaction. Cannot be combined with any other paper coupon for the same item. Pricing and availability of the underlying Blueberry Muffins (4-pack) item may vary by region; the published 6% discount applies to the in-store shelf price at participating Costco Wholesale locations and may differ slightly at express or fuel-station storefronts. Source: Coupon Aisle editorial sample.