easiest thing to do is to pick out the car you want, drive it, do all that, then when you get into the closing room before they even start the pricing, tell them that you want to see the invoice. i'd follow them while they get it to make sure it's the right one. do research before you go, see if the price on their invoice is close to what you had before you went (remember to add 515 for destination). i'd start at invoice and work my way up. but personally i'd just say i want it for this (invoice). it's really just that simple