You could get a used Riv. That's what I did. Couldn't afford new, so I just got a used Bleriot.
Try the Rivendell Owner's Bunch Google page.
https://groups.google.com/forum/?fro...w-owners-bunch
They always trade and sell stuff there.
Also the Bleriot Owners' Group on yahoo groups. http://sports.groups.yahoo.com/group/The_BOG/
You can also check all of Craigslist nationwide with one search at http://www.my-craigs-finder.com/