The M93B is now an endangered species and will soon go the way of the dinosaur. Still, I'm sure you could convince someone on AR15.com to sell you theirs. FYI, the M93B was replaced by this thing called the UBR. Stands for U
etter than the M93B you R
...uh....dammit, I forget what the "R" stands for. It'll come to me though.
Anyway, are you looking to build a 2007 retro gun?
All joking aside, check the EE from time to time, or gunbroker.