I have 2 smart keys, we wanted to get a 3rd key that would start the car as well....
I could get another smart key off ebay and program it, but its about $100.
A normal chipped key looks like about $30, but I wasnt sure if I could re-program it...
When we're travelling or camping we like to keep a spare key just in case : )
According to the key instructions you can have up to 8 keys programmed, but thats refering to the chipped keys, not the credit card style smart keys...