Hi Dima, I hope I did not mislead you earlier, the price I mentioned was for the frame only, I wonder if it is within your budget? The guy at the shop, Mr Deng, says the frame is at the distributor, and he will ask for photographs and geometry first. He can either send it to me or directly to you by e-mail so let me know what you prefer.
Hey Dima, I've asked a few shops, so far there are no 21/22inch mtb frames in stock but the closest i've come is a new 2009/2010 aluminium Orbea Alma 20in frame, dark grey colour. it is going for rmb2850, the shop says original price is rmb4000+, no one needs such a big frame apparently. it is in hongli road shop in futian, let me know if you want to visit the shop. also i might put up a note in the 2nd hand forums.
the trials guy i was telling you about, says you'll probably have to order a new 26in trials bike or frame, in the meantime he is hunting around for any used bikes. there really are very few biek shops dealing with trials it seems.