Hey, I arranged a Mozart Duet for solo bass, it's short... just 2 pages, but it has double stops and some runs so it's a good exercise.
$0.99 fixed:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=3764205160
$0.99 fixed:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=3764205160