Blues 8-Tracks
There may be a few more blues items on the dollar tapes page. Many blues-rock bands are listed on the rock or psych pages so check there as well.
Buddy Guy-This Is-Vanguard-M-; LS/TT; white Ampex orig $8
Lightnin' Hopkins-Keeps On Rainin'-Superscope-EX; odd budget label '70s issue $2