#http://www.amazon.co.uk/s/ref=nb_sb_noss?url=search-alias=aps&field-keywords=akasa+vipers&x=0&y=0
Thats where i bought them , but beware i bought the wrong pwm y cable. lol thats why i have not installed them yet.
saying that i have switched the eco stock fan wit one viper, and im impressed.
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The stock Sniper fan controller uses 2 pin fan connectors m8 (these are quite rare now), you gotta watch out for these little details as PMW fans are 4 pin.