Can anyone advise as to a source of self-stick teflon tape? I would like to
put some on the face of the rip fences on my table saw and band saw.
Thanks.

Not teflon specifically, but many woodworking suppliers have HDPE or
UHMW (low-friction) tape. I know I've seen it at Lee Valley,
Woodcraft, Hartville tool, and others. They also sell thicker sheets
or strips of the stuff that can be used to make a sacrificial fence,
drawer slides, etc.
Good luck,
Andy