You can get completely free live soundboard (and other) recordings of the Flecktones from "The Internet Archive"
http://www.archive.org/ The Flecktones have a good policy on concert trading etc. If you dig deep enough you will also find other great bassists such as Kai Eckhardt (Garag Mahal) and Alphonso Johnson. ALso check out another great traders website 'eTree'
http://bt.etree.org/ Primus, Pat Metheny all feature heavily on there and it's all of high quality and FREE.