So you're the guy putting in the 20 circuit panels. It drives me CRAZY when I go to do a job where they "already had the service changed, it was such a mess of different boxes". Well guess what lady, I'm adding another box, because the last guy put in a 20 circuit panel and there is no space left. Murray has a 30 circuit 100 amp main breaker panel for about $60.00 at the depot. Oh too answer your question I would charge closer to $900 or more for this. (Massachusetts)