wow lmao is it a factory one or aftermarket one? If its factory buy one off of ebay if its aftermarket the unit should be under the dash on the driver side find out the model # and a dealer who carrys the product and contact the dealer and for me it was 50 bucks for the remote and 25 to program.

But personaly i would try fixing it first. Pry the remote open, Get a bottle of alcohol and clean it real good with alcohol and q-tips