Long ago we found that we saved more money shopping at Costco than the membership cost by a long shot. We even get the executive membership because they will refund the difference of you don’t get at least that back rewards (we always have).

For things that are acceptable, it’s usually hard to beat Costco. You have to give up variety, possibly brand choice, and maybe even buy more than you’ll use, but it works out to be significantly cheaper. There are categories, however, where Costco is never the cheapest (soft drinks) or where the commodity store brand is significantly worse than alternatives (batteries).