The VRCC (Valkyrie Riders Cruiser Club) board is a dedicated Valkyrie Forum that has a section for Classifieds. People list Valkyries and accessories for sale all the time there. You do have to be a member, membership is free.
http://www.valkyrieriders.com/
There is also a Technical forum that is invaluable for finding information on the Valkyrie.
Good luck to your friend, sounds like he's got a good year and model to sell, especially with the low miles.
Hope this helps you out.
Dockem (aka Doc Moose, VRCC #506)