I think $500 is very cheaper if all included
Usually to install a new one, labor charge will be more than $1000, to take apart and put them back again, will spend more time than install a new one. if they reuse the old refigerant, there isn't refrigerant handle charge ( pay to Dupond? or similar manufacturer). and no new refrigerant cost.
Otherwise they won't make money, especially Direct Energy charge $100 for drive there( X 2). plus those cost.
What do you think?
So if $500 for all is very cheaper.