buying new class C

Depends on what you are buying, from whom, when and where. There are Cs sold factory direct, built to order, for which there is really no discount, except what you negotiate when you order. There are C's so much in demand that the dealer cannot get any in inventory, and that might be seller's market prices, MSRP Plus (all sorts of services can be tacked on), yet other dealers might take orders at a 20-30% discount. There are C's that have sat on the lot for 2 years without selling, dealer might discount more than 30%, a lot more if he can get a factory incentive to help move it.