I don't have a lot but here's some that I got and thought were good deals:
MISB TM Megatron $15
Perfect condition Optimal Optimus $15
Good condition TM2 Megatron $10
TM2 Cheetor $5
WST Grimlock for $15 total
Most BW I know, but most of my collection is BW and Movie but my Movie toys were almost all bought from stores.
Nothing extremely hot for me yet, maybe I can find better deals later.
EDIT: Forgot location, I got Optimal Optimus and WST Grimlock on eBay. The rest were from other TF forums.