Just bought my 2004 Suburban. When I put the key in (only key I received), it says Key 3 on the dash. Therefore, I cannot program Key 1 and Key 2 for memory seats, etc.

What are my options to get a Key 1 or Key 2?

 

Try Ebay or your dealer.

 

Try/ask a local locksmith. I wanted to program an additional key for my Denali, and the locksmith was a hell of a lot cheaper than going to a dealer.