A:Answerget a tape measure, cheap stud finder and a battery powered drill / impact gun and you could do it for the price of those tools or if you already have them, maybe 1hr or less of your time.
A:AnswerSince previous answer did not respond to your question (but took the time to not answer, which is odd), geek squad charges about $250 per tv to mount, plus cost of the mount itself.