I agree 100% with the previous poster. When you are shopping at a warehouse store (something I LOVE to do, by the way) you need to keep your head firmly attached to your shoulders and be a careful consumer. I buy the 8000 roll of toilet paper package, because, to the best of my knowledge, TP doesn't go bad. Could I possibly get it cheaper on sale at Safeway? Maybe, but I don't have the time at present to do all the comparison shopping. And my BJs takes coupons, so if I use those, I can still save. Milk is cheaper at BJs, eggs are wonderful and usually cheaper...rotisserie chickens are at least $1 cheaper and are larger than the puny, sad ones at the grocery store, jewelry/watches/DVDs are all cheaper at BJs...produce is usually excellent, and in response to those of us who can't buy huge amounts of perishables, our store is now packaging a lot of that stuff in smaller containers. In fact, we now do most of our major shopping at warehouse stores, and "supplement" at the supermarkets.
Right now, the store has a lot of wonderful holiday gift ideas...I (or Santa) will be buying a bunch of Christmas stuff there -- much easier than braving the crowded malls!
I also buy vitamins -- the BJs house brand (Berkeley and Jenson) is USP-verified, which is important to the pharmacist in me.
Sooooo, while I'm not sure if I save money, I get higher-quality products than I would at Wally World (my least favorite place to shop on the planet) and I enjoy the experience. And they have great snacks!!
PS I have a Costco membership as well...I'll be going there today...their inventory varies from BJs a bit. What can I say...Joanie LOVES the warehouses!