DoorDash announced a nationwide rollout of Costco on their platform and you can get 20% off your Costco order through DoorDash for a limited time. To get the discount, use the coupon code: COSTCO26 or COSTCO20 at checkout. The max discount from this offer is $50. Offer is valid for select accounts through November 1, 2026. Link your Costco membership in DoorDash to get member pricing.