That's crazy for a base model.
We called 53 dealers in 7 states in the midwest last fall and ended up finding our current SLT duramax at sticker in Indiana.
For the Denali we ordered in February, we are paying friends and family (supplier) pricing (basically 5% below MSRP) from our local dealer in Michigan. Only reason we ordered a Denali was because the dealer offered us $72K on our truck and the new one comes out to roughly $70K with the discount and we end up with what we wanted originally so I was ok with losing a bit on sales taxes.