Just purchased an '04 Trailblazer and it only came with 1 key - I know I can probably pay out the nose and get a key thru a dealer since you need a "code" which I don't have but is there any other option? I saw a key blank on Ebay for my year and make but how does that work? Will a locksmith then be able to cut me a key from the blank or will he/she still need the "code" ? Thanks for any info. I also need one for an '03 Olds Bravada for my Mom.