Remote door opener and starter kits
 

I got a few in on special for Christmas

http://cgi.ebay.com/ebaymotors/ws/eB...category=33724

the brain looks so much like the OE units in the car it wouldnt surprise me if you could wire into the stock wiring. If not, it would still be a nice alternative to for those whos stock remote door lock has failed.
And this one can do a remote start on top of it :D