How much would it cost to add key-less entry and remote start to my 2011 Mazda3 i Sport.(has power locks)?

Clayton

New member
I recently purchased a 2011 Mazda3 i Sport. It has power locks and windows. I went to best buy and they told me it would cost about $400 including installation of both the key-less entry and remote start.
Some have told me that my version of the Mazda has key-less entry already and that I just need to buy the remote and program it. Can anyone tell me the best way(cheapest) to accomplish this?
 
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