Where is the best place to get an unlocked, cheap phone running WP7?

So I've been using a Droid Incredible for about a year and a half now but find myself drawn to WP7. I almost got a windows phone when I bought my droid, but went with the incredible instead. I'm not up for an upgrade until January 2013 and was wondering if you guys would know where I could get my hands on a cheap windows phone, doesn't have to be top of the line, just something that I can use for a year or so.

Edit: Forgot to mention that I'm currently using Verizon.