If anyone has a list of cheap machines that can do this, I'd much appreciate the assistance.
Maybe not cheap, but off the top of my head:
Otari 5050 1/4" with a 1/4 track playback head.
Seems to me about any 1/4 track home deck could do it in 2 passes @ 7.5 IPS as well...so revox stuff, X2000R's, GX 747's, RT909's,etc etc. Tracks 2 & 4 (or 1 & 3) might play backwards on a home deck, but you can flip them around the right direction with your DAW easily enough. If your stuff is 15IPS, you could just double speed it in the DAW as well....won't be quite the same as a 15IPS transfer, but it would get it into digital and listenable.