Gigabyte GA-78LMT-S2P @ around 2.3k
FX 4100 = crap , the cheapest AM3+ processor. Only good ones are FX8150 and FX8120.
You can buy a AM3 Processor with an AM3+ Motherboard .
AM3+ processors are crap .
@ digit06 - tell us your maximum total budget and you neeed a cpu only ? what mobo and PSU do you have ??
Guys...Please answer OP's question first before other advices.
@ OP - Cheapest is FX4100 and all AM3+ Processors are AMD Only.
But there are better Options available like 960T which fit in AM3+ Socket, Cost near about same and perform better.