[Woodworker]

We have not given the dealer a deposit yet. We are trying to order a new RV and the dealer says that even though we will sign a contract for a specific price, the manufacture may raise the price 2-5 percent upon delivery. Is this something new? Is it legal? If I refuse to pay the difference and back out of the purchase the dealer won't return my $$ deposit. It sounds pretty sketchy to me! Any help?