I might just be having a slow day, but are you talking about the FOB?
If you are then I know of this from Dave Blacks site
http://www.daveblack.net/asp/3SiFAQ.asp I am not sure what the price is now, but sending an email to ask for the price is pretty easy. Instead of Libertyville, I use Wayzata Mitsubishi
http://www.wayzatamitsubishi.com/en_US/ for my parts ordering. They've been pretty good to me with their pricing.
Q: Where can I purchase a remote for keyless entry?
A: New remotes for keyless entry can be purcahsed from Libertyville Mitsubishi at (847) 816-6660 for approx. $25 plus shipping.
Q: How do I program the remote for keyless entry?
A: Programming the keyless entry receiver will be required when you purcahse a replacement "FOB" or keyless entry remote unit. The keyless entry receiver is located behind the rear interior panel near the drivers seatbelt (drivers side). Here are the steps for programming your remote for keyless entry:
- Remove the rear hatchback cover
- Remove the rear seat:
- Pull the two handles near the center of each seat section on the bottom portion of the seat
- Lift the seat bottom upwards and set aside
- Remove the two 12mm bolts at the base of the rear seatback on the drivers side
- Remove the driver's side rear panel:
- Remove the rearmost screw on the plastic strip that sits over the rocker panel
- Remove the screw on the cover of the rear seatbelt retractor then remove the cover
- Remove the screws holding the seatbelt harness from the frame. This can be tricky since there is little room to work with. Use a stubby screwdriver
- The seatbelt itself does not need to be removed. You can just remove the harness and leave the seatbelt threaded thru the panel
- Remove the screws closest to the rear of the car that are located on the plastic header and footer around the drivers doorframe. These typically overlap the rear panel by a small amount and may need to be loosened to move the rear panel
- Behind the rear panel you should see a box in front of the rear speaker - this is the receiver unit
- Remove the receiver from the car body
- Find the switch labeled SET 1 - FIX - SET 2 and move the switch to either SET position. (the two SET positions are in case you have two transmitters with different codes)
- Press any button on the remote transmitter
- Move the switch back to the FIX position
- Test the new remote transmitter
- Reconnect everything making sure that the antenna connector is tightly connected to the receiver