I have used origene in the past who supply 4 +ve vectors and 2 -ve for around £500.
I prefer Dharmacon (http://www.thermoscientificbio.com/dharmacon/)
I have heard good reports but I think they are more expensive, from Origene you get 4 different shRNA vectors plus controls for £500.
I've had great results using the Origene Trilencer RNAi system. With two of the three constructs giving me a nearly complete knockdown at 50 nM.
Thanks Thomas :)
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