I would suggest a couple things; every now and then, spray your car's seats with anti-static carpet spray.
Secondly, if you grab the door handle before getting out of the vehicle then the static will dissipate through your shoes instead of your hand.
lastly, install a static drain on your vehicle. there are several sites on the internet where static drains are discussed. basicly it's a 6-12" wire located toward the back of the vehicle attatched to the frame or some other non gas tank metal. I think K0BG has it on his website. www.k0bg.com
this will drain alot of the static built up away from the car and though you may still have some build up between the seat and your self, it probably won't reach shocking levels.
on the led key you mentioned... no. no idea where to find it. not that I personally would be in a hurry either.