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I just came back home from Costco. I found they have a whole shelf of coupons for Costco.com purchase. I have tested one and it works. Each one is good for $ 25 off $ 250 purchase on Costco.com and have different 7digit code on them and expires on 12/31/2016. You may save another 5% by using Chase Freedom or other cards that offer you additional cashback.