I'm a Costco member, and I do love Costco.
The fact that you can buy anything and then return it (electronics = 90 days) is just too awesome.
I purchased some baggage at Costco, within 10 months of using it, it broke, and i returned it, full money back, no question asked. One of the zippers broke. Thank you Costco.
I purchased some proximity sensor trashcans, and I lost the receipt. Broke a few months ago, Costco let me return it, put money on a gift card, and I got the same trash cans again, except their newer models.
My friend purchased a iPod Nano at Costco, didn't like it after a week, and returned it.
You don't even need to keep the box, as long as it's returned with all the parts that came with it, they will generally take it back.
I just wish they had a wider selection to purchase from, otherwise I just purchase their products and try it out, and return what I don't use or intend to keep.
I have 60 some odd days left before I need to return my PS3 move.
