Q. Does Costco really sell stamps cheaper than at the post office?
Yes, although not by much.
Costco will sell you 100 Forever stamps for $49.75. The current cost of a Forever stamp from the U.S. Postal Service is 50 cents, meaning that it would cost you $50.00 if you bought 100 of them. So, if you’re willing to buy 100 stamps at a time, you will save 25 cents at Costco versus the USPS.
Costco loses money on this deal; the post office isn’t giving them any discount. However, it’s a great marketing tool to make you think of Costco as a good place for cheap deals.