where can I purchase this unit?

Prowelder... http://forum.mopar1973man.com/members/123-Prowelder But I haven't seen him in awhile you might try sending him a PM and see if he's still building them.

Prowelder is a little too busy,is there anybody else building those units?

I just barely finished building mine. It honestly isn't hard, the connectors you'll need can be purchased from Casper's electronics and everything else I bought from digikey. If you've got a couple hours you can make one that'll work without anything tougher than soldering and drilling a box to mount the switches in

Shibby over on CF.com suppose to be making them now.