A couple of years ago I found a nice 30 mauser with a shot out bore for a reasonable price. I sent it to Redmonds to be rebored to 9mm. They do excellent work and it is a blast to shoot!
Gerard Henrotin has an excellent e-book on the C96
Also info here:
http://www.northwest-denture.com/mauser1896/index.htm
http://www.mauserguns.com/gungallery1.asp