My Costco membership expired, so I purchased a new membership through a 3rd party web site that also included some free coupons. I went to Costco and handed them the membership voucher, and they said they would not accept it because I am already a member. I explained that I already spoke to the Costco corporate office and they said it was ok to do this. The lady was being a major bitch and told me I could not use the voucher. After explaining that I could not return the voucher. She finally accepted. She was trying to powertrip my ass. I really enjoyed this experience at Costco. Thank you Costco.