Question: how much is a cheap power supply?
Answer: Evga 500 W1, 80+ White 500W. (Editor's Choice) ... 
Corsair CX Series 750 Watt. View on Amazon. ... 
Evga 750 GQ, 80+ Gold 750W. ... 
Seasonic G Series 650 SSR-650RM.
EVGA 600 B1, 80+ Bronze 600W. ... 
Rosewill Gaming Power Supply/PSU. ... 
Corsair Hxi Series.
Thermaltake Smart 700W 80+ White Certified PSU.