Where do you go for (cheap) geek gadgets?

eviljohn and I were talking the other day about how thumb drives have gotten quite affordable - if you get them online instead of in stores. I don't have a thumb drive (my birthday's on Monday: hint, hint), and we chatted a bit about places to find good deals on things like that.

I thought I'd ask you all - where do you go to get your geek gadgets? frugal? eBay? Newegg? ThinkGeek?

Someplace else?

I'm also looking to get an external hard drive for backups, and possibly a new phone though I'm having trouble picking one.

Oh, wise people of the web, advise me!