Originally Posted by leonard016

You don't have to be a Costco member to get buy their GC online. You can use the GC to enter Costco without showing the membership card. The downside to use GC is that you don't have purchase protection and extended warranty provided by Amex.

For big spenders, Costco has the "black" card - Executive Membership that returns 2% on purchases made through cashier (online purchase and gas are excluded). It costs $100 ($50 more than the regular membership) but has the potential to put money back to your pocket.