I don't know of any shares going, but there are a couple of 10bs on the market at the moment, both said to be quite nice, although one of them will need a new engine soonish (IO360s in aerobatic machines live short but cheerful lives). Perhaps you should talk to one of my co-owners, as he often goes on about of getting a second aircraft, in order to further his evil plans for world domination in aerobatic instruction, but I and the other co-owner tell him but that we have shelled out big stylee already and can't quite justify having two of everything. You never know, though. Send me an email via pprune if you want to chat about it.