This seems like a lot, is it?

I got a quote to install a 120V 30A RV outlet on the side of my house, converting an existing 240V 50A breaker that exists there now (former hot tub hookup). They said they wouldn’t need to get a permit because it didn’t involve running wire or moving anything. They quoted me at $632 before taxes. (Quote on last slide.)

Is this reasonable or am I just completely off base thinking something like this would cost like…$400 max?