Newegg has the AMD AD3870WNGXBOX A8-3870K Unlocked Llano 3.0GHz Socket FM1 100W Quad-Core Desktop Accelerated Processor Unit (CPU + GPU) for $120 with free shipping. Includes $25 Newegg gift card with purchase. Features DirectX 11 capable AMD Radeon HD 6550D graphics.
I thought I'd compare that i3 2100 to this... cpu-world is a little hard to discern in that if you scroll to the bottom of the performance there's there a couple mobo/memory/graphic not sure what systems are with what.
http://www.cpu-world.com/Compare/356/AMD_A8-Series_A8-3870K_vs_Intel_Core_i3_i3-2100.html
Also found this which is through.
http://www.hardwaresecrets.com/article/A8-3870K-vs-Core-i3-2105-CPU-Review/1470