I don't know anyone with another 68k calculator... then again, I don't know anyone with an Nspire either- everyone I know has an 83+/84+.
Although, the 68k would seem to have one advantage over the Nspire for programmers- TI isn't actively fighting assembly support for it. I imagine when Ndless ends up supporting Nspire 2.0, TI will release another version with some of the exploits fixed, and so on... whereas, there hasn't been a new 68k OS (or hardware version) for a while now.