Welllllllllll, i just cracked my case for the key of the IS. And now im comptemplating wether to go to Lawrenceville Lexus and get a new key made .. 200. Orrr i could get a RX300 blank key off of ebay. I would swap my computer chip thingy into the new key and we are off to go. But one question , would the RX300 key fit into the ignition or would i have some problemos.