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Cheap Car Key Fob Replacement Unless your fob is one of the fanciest "smart" models that are integrated with advanced security systems for vehicles, replacing it shouldn't be too expensive. The key is to shop around. Most dealerships say they can't offer lower-cost fobs since they have to have special programming equipment that is compatible with many newer cars. But there are a few alternatives to that. 1. Purchase a new battery Most key fobs are clamshell-style and open along