To date I have had what I consider to be three great JBL finds, not as great as some others have found, but I think they will do.
#1 - very nice pair of 4311B's. Found at a thrift store. The cabs are near perfect, grill cloth is okay but could look better. paid $30
#2 - all original pair of C40 Harkness with the spun aluminum feet, blond oak cabs. Found at an estate sale where I was the first through the door and the other folks were wondering why I would want those. paid $400
#3 - near mint pair of L100's. The cabs are perfect (they were placed in a built end wall cabinet at the ceiling), of course the foam grills are long gone, but otherwise fantastic shape. Found at an estate sale where I didn't show up until noon and no one had noticed them, not even the folks running the sale, until I did of course. paid $10
These JBL's just keep following me home, but I love it that way.