Welcome to the forum.
$200 for a key with no remote circuitry, ouch!
First we need to know which entry system you have. Go to the trunk of your car, lift up the cover where the spare tire is, or would go and take a picture of that sticker on the cover that contains your RPO codes.
Then go to the link I've posted below and find which of the RPO codes is listed on your sticker to indicate which entry system you have. Once identified, you can choose your source for purchasing the appropriate remote, although I'd advise you to check ebay for a deal to avoid what might be a second "black eye" if you go back to the same source that left you in this predicament, unless a remote was offered and you declined.
https://www.rockauto.com/en/catalog...1441080,electrical,keyless+entry+remote,10433
I recently read that there is a way to program the key to the car yourself, so an ebay vendor may include instructions on how to do this with their remote, so look for such a listing. If not and you have AAA, they should do it for you as part of your membership.
AAA programmed a valet key that we had for no additional fee, after the single working key for another vehicle was stolen along with a new jacket, so depending on your circumstance, joining AAA for a better over all priced solution, might not be a bad idea, as a member here did a short while back after being completely locked out of a newly purchased CTS without a key.
