TrailBlazer Spare Key Needed

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.
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I STILL HAD THE WARRANTY AND SO GM PAID OUT OVER $800 TO TOW MY TBZ TO A DEALER ONLY TO HAVE THEM SAY "WE DONT HAVE THE RIGHT KEY CUTTER"
SO I WAS TOWED AGAIN TO ANOTHER DEALER AND THEY SAID THE SAME THING BUT CALLED A LOCKSMITH AND HE CUT ONE FOR $6
GM SPENT 800 IN TOWING COSTS JUST TO GET ME A $6 KEY THAT WASNT EVEN A GM KEY
I DID HAVE TO BUY ANOTHER REMOTE WHICH WAS 50 AND THEN SPEND 30 MORE TO PROGRAM IT
MY DODGE NEON NEEDS A KEY CODE BECAUSE IT HAS A CHIP IN THE KEY
AND THATS A DIFFERENT STORY