Does anyone know if I can find the locking mechanism for the sliding door at autozone or advanced? Also how much it would be. I can't seem to figure out which part it would actually be on the webpage. Or do I really need to go to the dealer.

The outside door handles are prone to breaking - visit the junkyard or dealership. If it's the door innards your looking for the dealer will likely be the only option. Get fresh plastic clips that hold the operating rods together otherwise it may come apart at the worst time for you to repair it.