Just a quick quip to say that I was frustrated that the dealer wouldn't come up $1,000 on my 2017 Denali (pristine w/ 58k miles) so I got 3 years of XM and 5 yrs free oil change and tire rotation. That value was on par to me and the tax savings for them not giving up the $1k wasn't a deal breaker. However, maybe that's the lawyer in me but I was ready to walk and told them no deal until they started offering the above. Dealers don't want to go and try to find another buyer knowing they've got you on the hook. Moral of the story...you can't get something if you don't ask.