Oh they can get it, even if they pay for it. Push for a super price on three years of extended warranty, then let them pay 1/3 and you pay 2/3, or maybe even half and half. I'm sure the dealer would much rather be out a known amount of money now and not take a gamble on future costs. Plus warranty repairs probably will cost him only his actual out of pocket cost minus the warranty reimbursement. If he's a great dealer he'll give you a 10% cut off MSRP on anything extra you buy anyway.