I bought my 2005 Fleetwood Expedition for 31% off of MSRP.
I got about 15% below low retail for my trade in. If you are buying with no trade it is simpler. 30% is about the max they have to play with. Some mfrs even less.
Shop, shop, shop. I bought out of state and can tell you I had NO PROBLEMS getting it serviced locally in Florida. Beware the huge dealers with high overhead. Lazy Daze couldn't come close to the price I found in Ohio at Holman Brothers.
They were EXCELLENT to deal with.
Also call lenders and get finance amount quotes for specific rigs you look at.
Having said all this, I would buy a used quality DP like a Foretravel.
My Kharma ran over my Dogma.