Ebay keys FTW. I purchased one not long ago from
this exact seller. When you still have a working key, programming the new one is easy.
I looked for Bill's thread, but all I could see is instructions for programming a new fob, so here's for the key.
1. Insert an existing programmed working key into the ignition cylinder.
2. Turn ignition to the ON position and back to OFF
3. Remove the existing key and within 10 seconds insert new key and
turn it to the ON positiion.
4. The security light will light up for 2 seconds to indicate successful
programming of the addtional key. Remove key from ignition.
5. Insert key and start vehicle to test key.