parts less than 100 bucks i bet,but the labor would probably be about 5 hours at 65-85 an hour i bet. my guys can usually fish the wire and install a 240 outlet in 2, and i charge 110 per hour for 2 people. 65 and 45, journeyman and apprentice/ helper. while i say usually, if there is anything that may make it take longer we will double the quote. we usually try to get people to hire us for t&m 2 hour minimum tho, saves them money most of the time and gets us more work since we dont have to quote worst case scenario.
edit: post above reminded me of the panel space, hehe. double breaker is easy to add, wiring is usually easily done in attic space. im industrial tho, so this may be skewed for residential.