I'm looking for a very specific used bike, I've tried ebay and CL and wandering around the internet. Anyone have any pointers on where else I might look?

I'm looking for a 1998, 1999, or 2001 GT Slipstream in either an 18" or 20" frame.

A good friend owns one and this bike fits me like it was designed for my body... unfortunately she doesn't want to part with hers.