Charles,
I got the bearing from McMaster Carr. The motor is an E-Flite 15 and I bought an E-Flight 25 shaft to use in the E-Flight 15. Its about 1/4" longer and just the right length for the bearing. I made the bearing mount out of a small piece of basswood. It's real simple, but it works. I have a pic somewhere that I'll post when I find it.
Rick