That price differential is pretty typical in comparing the high volume/low margin dealers against local dealers. We saved tens of thousands of dollars by purchasing this Mobile Suites at RVs for Less in Knoxville, TN versus a Texas dealer who shall remain nameless.... Certainly enough to pay us to drive from the Houston area to Knoxville to pick it up, especially since we had a vacation planned in the Great Smoky Mountains anyway.
As far as dealer pricing, I don't know if the high volume dealers get a deeper volume discount from the manufacturers than the local dealers or not.
One thing to consider is the availability of service. It's a non-issue for us because I deal with the minor issues myself, getting parts directly from DRV as required. If anything should arise that I can't handle during the warranty period, DRV is good about authorizing service at independent RV repair facilities who, unlike most dealers, live and die by the quality of service they provide.
Rusty