I got mine from Cheetahrc.com in the US. I think it was like $180-90.

I do have spoileron mixing in it. Its a little less than an inch of up flap mixed with up elevator and down flap with down elevator. With this set up, harriers are mre stable that my 33%ers. Also I am 2 inches behind the CG which helps. I don't have anything else going on thats out of the ordinary.