Ive only been into a BJ's once with my mom. I didnt noticed the prices being alot cheaper but they had alot of different items than Costco.
I have a Costco membership and I love it! The reason I love them is their return policy. You can take almost anything back. Ive taken 3 playstation units back.(original price $199) All were over a year old and stopped working.

And if you have the receipt , you get every penny back. We bought our big screen tv there because of that. I ask the manager if anything went wrong can we bring it back. He said yes, even if its 5 years from now. Only thing , you need to hang on to those receipts. If you take something back without the receipt you get the last sale price of the item. I believe computers are only 6 months guaranteed though. I feel confident buying from them. So that would be my only concern between the two. I would rather have an awesome return policy then save a few bucks.
