I just purchased my infrared remote key for $112.00 today. from dealer. Mine went bad after several drops on the ground.
It had been drop several times before, but this last time was one more to many. New batteries can't help this time.
You might want to check other dealerships in or around your area. my remote only has one large button, 96 s320, I have a 98 S320 which has 4 buttons (unlock, lock, trunk,and panic) this may cost more.

gfdent