I bought my '08 (Built 08/07/07) in April '09 for $14,000 off of sticker. Sticker was $44,410, my price was $30,300 cash, no trade. $2900 GM Card rebate came off of that. A month before that, my dad bought a new red '08 GMC 1500 ccsb 4x2 that stickered for $31000 for $17,100 cash and then got his$3500 GM Card rebate on top of that. Of course, that was when GM was at its low point, so that factors in.
There are still several new 2008 GMC CCSB 4x2 SLE2 Dmax trucks identical to mine (fleet cancellation maybe?) available. I saw them still advertised out in California and there were at least 3 in mid Missouri.
It can be interesting when a new vehicle sits so long that the factory rebates no longer apply.