Microcenter almost always has free motherboard deals, the specific motherboards and cpu models available change but they've consistently got them every month for a good 2 years now.
With that said, the FX processors really aren't that good for gaming.
"With the sub-$100 Pentiums performing so well, Intel's $125 Core i3-2100 easily beats more expensive Phenom II and FX models. And the $190 Core i5-2400 dominates the sub-$200 landscape without challenge, really. As such, we're almost-shockingly left without an AMD CPU to recommend at any price point." This comes from this review. http://www.tomshardware.com/reviews/gaming-fx-pentium-apu-benchmark,3120-10.html