Don't get so fixated on the price, that you ignore the RV itself. Test every appliance, slideouts, generator, look carefully for signs of leaks, check the date on the tires, and see if there are service records for the engine. Once you are totally satisfied with the condition of the motorhome, then begin your negotiations.
Like you, once retired looked for a motorhome. I had a list of "must haves" - deal breakers, narrowed down to 2 manufacturers - Newmar and Tiffin, set my budget limit and hit the internet, and local dealers. I bought my rv from a private seller, still have it 6 years later - fulltime in it.
Good luck in your search
