How can I replace my key and fob?
Even if you do find one, say on ebay, you are still going to have to take it to the dealer to have it programmed. Your best bet is just to head over to the dealer and have them give you a new one.
Search Chevrolet Impala Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chevrolet Impala Experts