[deserth3]

I used the GM supplier discount on mine. Saved about 4 grand. Biggest hassle for me was remembering my login and password. I managed to forget it when I left the house.
Once you get an authorization number you have 30 days to use it. You will also have to give the dealer a recent copy of a pay statement.
They're selling well enough out here. What you see on the sticker is what you pay.

Good Luck