A few months ago my mouse was hovering over the Buy button on Jim's site when I got a call from my son-in-law offering to let me purchase a computer through his vendor. He buys computers in bulk for a school district, so it seemed like a good way to save some money.
Long story short: the buying process was painful, delivery took forever, the system wasn't configured the way I'd asked, and in the end I only saved $150 over Jim's price because I had to pay Washington State sales tax. Next time...