On Craig's List you will find the rebuilt ones for FAR less than new and they will offer a one year warranty on them. That's as good as the new ones for a fraction of the cost. That is how I got my A/C unit on my 18' TT and the guy came to my house and installed.
He worked for a company who did all the appliances, for RV's for 20 years and then got laid off so opened his own place.
When I am surfing Craig's List and see ads for stuff I don't need now but may, I save the ad (you can copy and paste it in Word, or in my case I convert it to PDF).
Obviously, you only save the ads that have a personal e-mail or the telephone numbers. However, if you are a full timer, this option may not be an option for you as you would need to be local to get the repair under warrenty (if needed).
Sheila