Shop online easily and quickly
set your Mastercard® as your default payment method.
Save your Mastercard® in 3 easy steps:
- Select "My Payment Methods" under "My Account"
- Add your card details, ensuring the "Save as Default Payment Method" box is ticked
- Click "Add card"
Your details will be securely stored and ready for all future purchases.
For discount to be applied: (i) case-sensitive promotion code: MASTERCARD15 must be entered on the payment page, (ii) order must be over £150, and (iii) Mastercard card must be used to complete the transaction.
You will need to be a valid Costco member and make a purchase by checking out directly with a valid Mastercard, (i.e. payment made using digital wallets such as ApplePay, Google Pay, Samsung Pay, PayPal will not count) to take part in this promotion. Code not applicable in the Costco app.
Voucher is only applicable on www.costco.co.uk, and not redeemable in the warehouse. Limit 1 per membership. Maximum 2,000 overall redemptions during promotional period valid only on 1st December 2025. Costco reserves the right to withdraw this offer at any time and without prior notice.
Offer is strictly non-transferable and cannot be sold or exchanged for cash. Cannot be used in conjunction with other offers including vouchers provided by Mastercard. Costco reserves the right to reject the use of this voucher with reasonable cause. Voucher is only applicable to the product. Ineligible purchases include new Costco memberships, renewals, online subscriptions, vouchers/gift cards, stamps, tyres and gold.
Products sold online may have different pricing than the same products sold at your local Costco warehouse due to shipping and handling fees charged for delivery.