SVC has a pretty decent deal on a re-certified OCZ GameXStream 700W PSU. This is a great PSU and even though its a refurb it has a 1yr warranty and both OCZ and SVC are pretty good about their deals. Not to mention you don't have to deal with any rebates.
OCZ OCZ700GXSSLI GameXStream 700W SLI ATX12V 2.2 Power Supply - Recertified*at SVC.com
Sale price $39.99 + shipping (for me about $7)
Features:
700w
Nvidia SLI™- Ready Certified
OCZ PowerWhisper Technology for ultra quiet operation
Internal 120mm fan w/ blue LED's
150 x 140 x 86mm (W x L x H)
ATX12V v2.2 and EPS12V 80% @ 115V (Typical load)
83% @ 230V (Typical load)
Overvoltage / Overcurrent / Short-Circuit protection
Active PFC
MTBF:100,000 hours
100~240Vac 10-5A 50/60Hz
Maximum ratings are shown. The combined output of all 12V rails is 72A at ambient room temperature of 20 C.
1 year warranty
Refurb OCZ GameXStream 700W PSU $40 + Shipping 
