I use Costco all the time for computer hardware. It may not be the cheapest, but it is by far the best costumer service I have ever seen. I had a Maxtor 8GB HD for over 2 years, when it died on me. I took it back to Costco, without a receipt, and they refused to exchange it. They insisted on giving me a full refund! I ended up taking the cash and buying a 40GB and still had change left over! Ever since then, I have given Costco a very good chance at my business. I have heard similar stories from friends aswell. The only downside is that they have limited selection.