Just got a quote of $600 from the electrician for installing a 240v 14-50 outlet just below my breaker box.
Tell him it's for a big gas guzzling RV and he'll charge you $200 ...
Yeah, that's a bit pricey if you've got an easily accessed space, not any kind of weird construction, room in the box.
FYI, the Hubbell outlet is considered more of an industrial spec, better constructed, supports more insertions (though that's greatly overblown if you're not doing it daily), it would at least support that price (they're like $100 vs. $15 for a chain store brand).
What's the hourly rate? $125? So if it's a cheaper Levitron, some #6 wire, a basket and plate, that's ~$75 worth of parts, heck call it $100, so $500 for labor? Are they seriously suggesting it's a 4 hour job?
You might also ask about a 3-wire run to an N6-50.
FWIW, ours was $220 with parts.
[Edited to add] Maybe there's some kind of permitting cost, so hourly rate + better parts + permit?