USB to ALDL 160 Baud Pin E or 8192 Baud Pin M cable for $55 shipped -

http://www.reddevilriver.com/aldl.html

It does use the FT232RL chip

By the time you do $10-15 for the FT232RT USB, 20.90 for the OBD1 ALDL cable shipped, $5 for the box you are at $40. The pre-built cable is $50 + $5 shipping.