DHey man, that sounds very frustrating. first it doesn't matter who gives you the code, I got mine that way.
But there are other options. Go to
www.carsdirect.com I just did a quote for the vehicle as you are describing (2008) on Houston's zip code and I got $32,112 for an MSRP of $35,645
I have several friends that have bought from Cars Direct and they all said it was a stressless experience.
Go get your truck!!!