Best place to buy a sprint phone without a contract?

[FDF12389]

Any ideas would be appreciated. I've heard with sprint you need to stay away from pawn shops and ebay because the ESN needs to be clean. So where would one purchase a replacement on the cheap?

RIP treo.

 

[olds]

Here's an idea.

 

[EagleKeeper]

If you check the ESN before purchase, there should be no problem.