We have been selling these for about a year now, made a Youtube video today showing one in action on a car here.
Includes a billet button (several options available including no button), relay and install supplies. Pressing the button will cause the car not to crank (same as a dead battery), press the button again and the car starts like normal.
1982-92 Camaro/Firebird Starter Disable Device (screamingchicken.com)