If you are in USA, Fx6300 + Asus M5A97 R2.0 ATX AM3+ Motherboard for $215.
PCPartPicker part list:
http://pcpartpicker.com/p/2OjTH
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($119.99 @ Newegg)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard ($94.79 @ Amazon)
Total: $214.78
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-06 11:10 EST-0500)