I bought a membership from groupon to try because Costco wasn't on there yet and it was basically free to try. I actually never found amy items I couldn't live without or were a super discount. I used my freebies. I bought a rotisserie chicken for five bucks that the hubby did like. It didn't seem like a lot of selection. I think I did get a good deal on some nice pecans. I forced myself to walk through and but maybe three items and let my membership expire.
Costco did end up being on Groupon and I bought it to try because people rave about it. I have to limit my trips because my bill is too much with random stuff. I didn't think I would like any membership place and was only seeing what the hype was about.