I bought a generic key off eBay, had it cut at the local Ace hardware, and had a locksmith program it to the truck. It was 5 years ago, but I think it was like $50.
+1 to the locksmith for $50.
Or...there is a procedure for programming a new key with no additional tools. And you can program a new fob with the Tech2 that you will buy within the first week of buying your Escalade
To program a new key:
1. Insert the existing key into the ignition of the vehicle and turn to the “ON” position.
2. Watch the THEFT light it will go out within 10 to 20 seconds, when it does turn the key to the “OFF” position and remove it from the ignition.
3. Insert the new transponder key into the ignition and turn it to the “ON” position
4. Watch the THEFT light it will go out in the same 10 to 20 seconds, when it does turn the new key to the “OFF” position and remove it from the ignition.
5. Reinsert the key and start the vehicle to confirm the programming has worked.