item.taobao.com/item.htm?spm=a230r.1.0.195.j3znKL&id=16021281995
180 RMB, about 30 dollars each.
I bought one. The function is alright, but the key just makes me feel sick: it clicks like the key is stick to something.
Sorry for my bad English expression XD
This could be due to sticking and/or broken mylar keyboard contact foil areas, usually where the key plastic finger touches the foil.
I have seen several Pioneers suffering from this, but so far there were no malfunctions on those units.
This can only be "repaired" by replacing the mylar foils. Maybe you could use the foil from a cheap 10B.
In any case you would have to open the shell, which is described somewhere here in the articles forum.
Ray