Evening-
Assume you are referring to the free standing type, and not the ones most have in their campers, which run either DC or gas.
I have seen the freestanding at REI, a couple of years ago, but haven't ever used one personally. We thought about it but the pricing was pretty much out there.
Believe the prices ran about $700-800 for a small one and $1100-1200 for the larger divided unit that had a freezer and a frig section. Neither was really large--just about the size of a large cooler. Prices may have come down, as they often do as a product "matures" in the market.
Check them out at REI. Link here...
https://www.rei.com/search?q=Camp+refrigeratorDoesn't look like they have come down.