There is a cheap solution: Take the transponder pill out of the key, and tape it to the inside of the ignition trim with electrical tape, and just make a copy of the key blade for $30 bucks via keysinthepost.com or a competitor (it's simple: you just upload them a pic of your current key blade).
I've posted the full description of the hack here:
Ultra Cheap Second/Backup (Valet) Key Hack/Mod - Rennlist Discussion Forums