The new car keys come with a computer chip in the key, that is the cost issue. My jeep was 270$, with the key less goody box attached. I bought a second key from the dealers parts store that has the chip that was matched by the dealer (to th jeep) for only 70$. So with the second key I have to use the key to open the door. OMG tragedy! See if a similar key is available for the Infinity.