I use both Sam's and Costco! Sam's carries the one-gallon sized tea bags that I use and that's the only place I can find them. Everybody here and all our visitors drink iced tea constantly! Costco is closer and boyfriend buys gas there, so I go there most of the time.
You can get tires for your car, computers, DVDs & CDs, cameras, prescription drugs, tv's, mattresses, eyeglasses, (I get the cheap readers there--$18 for four pairs. They also have real eye doctors & prescription glasses) clothes & shoes, and of course I buy books there, too. (I buy books anywhere they sell them.) I get gifts there, too. They have pretty cool kitchen stuff--dishes & small appliances & such. Plus, both have bakeries and their cakes are delicious--a huge cake is only $14 and they will personalize for birthdays or showers for free.
I know Sam's occasionally sends out visitor passes in mailers around here, and when I worked at the hotel, both stores frequently offered one-day passes for my employees. They both have websites and you could find your closest ones & call their marketing reps & ask for a one-day pass to try it out. I think we pay about $35-$45 per year for membership and both include cards for me and boyfriend.
My mother lives about 80 miles away but comes here often and she has Sam's membership for the vitamins & OTC meds and just shopping, of course. She buys some beauty products there, too--I just don't remember what.
It's definitely worth looking into. I used to think I'd never spend enough to recoup the membership, but I definitely do and I think I've had at least one membership pretty regularly for about 7 or 8 years. When I was in the hotel business, we would buy snacks for sale calls and we'd also run there to get food for the restaurant when we were running low between deliveries.