Do the Cobalt keys have the micro chip inside or does it depend on the model, etc? How can you tell if it has a chip or not? I was thinking the keys with a chip have a little + on the shaft, like my Malibu, but thats just my guess. Most hardware stores can do the regular keys pretty cheap, but the chipped models are a bit pricey. We do have a mobile locksmith in this area that does them for about $30 if I remember correctly, which isnt bad, but the non chip key was $5 I think.