Just under $700 for the cheapest GREAT 290 build.
PCPartPicker part list:
http://pcpartpicker.com/p/GWMdzy
Price breakdown by merchant: http://pcpartpicker.com/p/GWMdzy/by_merchant/
CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor ($179.69 @ SuperBiiz)
Motherboard: ASRock H97 Anniversary ATX LGA1150 Motherboard ($71.99 @ SuperBiiz)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($60.98 @ OutletPC)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($48.89 @ OutletPC)
Video Card: XFX Radeon R9 290 4GB Double Dissipation Video Card ($239.99 @ Micro Center)
Case: Cougar Solution (Black) ATX Mid Tower Case ($38.99 @ SuperBiiz)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($49.99 @ NCIX US)
Total: $690.52
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-02-14 23:03 EST-0500