Randy,
If you don't mind pluging/unpluging your printer (or, if you have a USB printer), you can easily assemble parallel_port-to-JR_transmitter cable yourself. The simpliest parallel cable will cost you about $5 in RadioShack parts and an hour of soldering.
Use any Futaba wiring diagram (available in FMS mmanual as well as in many places on the Net, drop me a line if you can't find it) and change the connector on TX side to a mono plug. The ground wire is the central pin, and signal wire -- the outer one.
Hope this helps,
Boris (bluesky123)
[email protected]