If your just after a snowfoam, I found a solution... After having a bit of a DOH! moment last week, I had to borrow my parents washer, which I thought was a karcher so on the way to buy it, I dropped into halfords to buy there foamer (its about £14) bought it, picked up the washer and realised it was a Clarke, and then found that Karcher parts dont fit other washers... should have realised DOH! Anyway, went back to halfords to check out the Karchers and found they do a hose link for their attachments, got home linked it up and it made decent foam... even from AG shampoo!
Will still wait for a deal to come along though on a decent PW...