Clinton...They don't sound too bad on the autoharp, though I'd prefer to have my fingers free, so maybe crazy glueing one to a thumb pick would work. They also get a real finger-like sound on electric bass, though I don't know what would be wrong with actually using one's fingers. Anyway, sorry for the aside.
If you really want 'em, try Jensen Music in Owen Sound, that's who gave them to me.