Costco Blows the prices
if I'm buying at boxed I'm looking for savings
and I'm not looking to buy products I won't normally buy
Im ONLY looking at staples
Diapers
Bounty
Tissues
Detergent Etc.
Was Boxed Express not available for you? I'm 99% sure my Express stuff was actually filled at a local Costco, and the prices were basically the same. Layer on a 50%+ effective discount and we're in business.
ETA: To be clear, the 50% I'm talking about is the amex offer plus $15 off $60 new customer offer. I've yet to make a boxed order that didn't rely on some similar combo of offers making a huge effective discount.