Howdy and welcome!
You might check out the Class B Motorhome section for more info about those. Usually the "best deal" is the one that you feel good about. Generally speaking, a brand new motorhome is negotiable by 15-30%, with lots of variables. (How long it has been sitting on the dealer's lot, year-end new models, etc.)
Also check the "Full Timers" Section for other info. There are mail handling services available for a fee but I haven't used them and really don't know much about it.
If you spend time reading on the various sections of the forum, you will learn more than you ever wanted to know about the lifestyle! Good luck and have fun! Don't be shy about posting questions.