PPL motorhomes (on the Internet) tends to have the best appliance deals but, with shipping, I don't know how much you will save. I would find a mobile RV tech first, then discuss with the tech the best source -- he/she may have a commercial account with a manufacturer or two.
Best way to find a mobile tech is to drive in to the nearest decent commercial campground and ask at the check in desk.
new (usually dirty) Nissan Titan XD (hardly paid for)
Middle-aged Safari SE
Young, lovely bride