Funny you should ask but DH and I made an afternoon of checking out the Costco which is 4 miles away to see if we should join. We made a long list of things we usually buy and went comparison shopping ( Yikes, I forgot to check kitty litter!.) I would say maybe half would save around 10-15% and the rest aren't any better or are higher than other places we usually shop at. Seems like everything is around $10 so I imagine folks walk out of there having spent hundreds on each visit. If we had a larger fridge/freezer and a good-sized pantry (we have neither yet) than it might be worth it. For now, probably not. Also, I did not like the frenzied customers and abundance of giant SUVs in the parking lot fighting for a better space - it just felt "conspicuously consumptive". We do pretty well just "cherry picking" sales at 3 or 4 places and I still order things from HEB back home when they have free shipping.