Lawrence-
I am looking for the same thing. I checked out some posts on other sites and it sounds like rebuilding a turbo is pretty easy. I have a K26/8 from my friend's turbo S with 150K miles on it and want to rebuild it and put in on my 86 with some larger injectors.
Anyway, it sounds like there are kits out there that consist of bearings and seals for around $125. If the turbo isn't damaged and just worn out, the rebuild is a no-brainer. Check out this site...
http://www.turbocompressori.net/turbochargers_parts.htm
-g