
I know ours did let us walk around and look before buying membership but we couldn't buy anything till we joined. also costco has 100% membership refund if your unhappy with it.Does Costco allow people to check it out before joining? If so, why not make a list of your walmart purchases (including prices) and go to Costco to compare? If you do that, make sure to price compare based on unit pricing since the warehouses often have items in larger amounts/containers.
FWIW I would also factor in the cost/value of convenience. Is Costco closer than WalMart?
I think Costco saves, but you have to know your prices. You also have to get only what you went for and not get the big screen TV or set of luggage you don't need, just because the price is good. The Kirkland/Costco brand is excellent and cheaper. We buy the Kirkland paper towels and toilet paper - DH is infamous for calculating the per-square price of the toilet paper and it is a lot cheaper. I'm picky with toilet paper and won't get scratchy or single ply. The Kirkland is comparable to Angel Soft IMO.

We are real Costco fansI think Costco saves, but you have to know your prices. You also have to get only what you went for and not get the big screen TV or set of luggage you don't need, just because the price is good. The Kirkland/Costco brand is excellent and cheaper. We buy the Kirkland paper towels and toilet paper - DH is infamous for calculating the per-square price of the toilet paper and it is a lot cheaper. I'm picky with toilet paper and won't get scratchy or single ply. The Kirkland is comparable to Angel Soft IMO.
You also can get good deals on things you do want - we wanted the Cuisinart Griddler and it was $20 less than anywhere else. They have great prices on books, hard cover and soft cover. The prices on contacts is excellent. Printing photos is 13 cents a print, no limit. They have good prices on meat and produce, but again, you have to know your prices to compare to your local supermarket, Wal-Mart, or in our case, the weekend produce market.
Immodium (their brand) is 75% cheaper than Target and Walmart's brand. Feminine products are always the cheapest when they have a coupon to go with it. I'm always amazed that people buy TP and paper towels at COSTCO. We checked them AGAIN yesterday because I keep seeing people say they are getting them there.
Bounty paper towels
COSTCO - 24 rolls $18.99 -- $.79/roll
HEB - 16 rolls $10 -- $.62/roll
Randall's - 24 rolls $10 (AND you can use a coupon that might be doubled or tripled depending on amt)
Charmin
COSTCO - 36 (double) rolls $18.99 -- $.53/roll
HEB - 24 (double) rolls $10 -- $.42/roll
Randall's - 36 (double) rolls $10 (AND you can use a coupon that might be doubled or tripled depending on amt)
Granted, you have to wait for HEB and Randalls to put their stuff on sale, but since we're stocking up anyway that is not usually a problem.
I also find their organic milk prices to be higher than HEB's Central Market Organic milk. But we do buy their (Kirkland) individual milks for DD's lunches.
COSTCO does have good prices on cheese and most meats (NOT hamburger).