i have been sourcing for PSU for S9.

i had bought 3 PSU Delta 2400w (with breakout board) from Paralellminer/Centrix.  Very high quality product however they cost about USD109 (exc courier) / USD140 each (including courier).   very happy with these products except for the price.

http://www.parallelminer.com/product/2400watt-200v240v-power-supply-kit-for-2-antminer-r4-platinum-94-efficiency/

i had been browsing through Alibaba and they seem to have dedicated Antminer S7/S9 PSU.  Approximately USD88 each (exclude transport). One company in particular seems to have a PSU division for mining !  

http://aplus-powersupply.com/products/bitcoin_powersupply

quotation for S9 PSU:

"S9 S7 Power supply (12V 140A 1680W)
High quality industrial grade electronic parts&components to promise 24 hours long time working

-100%New
-Effciency 93~94%
-Including 10 pcs 6pin PCIE connectors
-Six months warranty
EXW Price:$88/pc"


i wanted to see what is your opinion on using these PRC PSU suppliers.  

the key attraction is of course the price but question marks about the quality.....any feedback....