Newegg has the CORSAIR Professional Series Gold AX850 (CMPSU-850AX) 850W ATX12V v2.31 / EPS12V v2.92 80 PLUS GOLD Certified Modular Active PFC Power Supply for $190 - 10% off with coupon code CorsairPSU1
[Exp 10/19] - $20 rebate
[Exp 10/19] = $151
with free shipping. Features 90% efficiency at 50% load, single +12V rail, and an ultra-quiet 120mm fan.