Is this oen of the dealerships that does the cute little "sheet", lot sof bright colored marker, and many trips back to "The boss" who has to agree to the deal???
Is so, throw them off their game. Make the offer and fill out the sheet. As the salesman walks to the boss, follow him. Now you are in front of the "man" who makes the deal. Be as nice as you can, and have your checkbook in your hand. Tell them you dont have a lot of time to make this deal, but you'll buy right now. Figure out a reasonable offer then give the "Man" the offer..make sure to say, out the door..with everything. If the retail price of a 2012 c14 is 15,899, try somewhere around 13,500-14,000. Low, but high enough to let them know your serious. It will probably be too low, but at least your starting low and working your way up. Far easier than the other way around.
If you dont say, "Out the door" or "everything" this leaves the door open for huge freight, set-up, and doc fees. When it comes down to it, OTD is all that matters. Not how the price got there.