What would be the cost of parts and repair of a main relay replacement in a 91 honda accord ex?

see first question.it's easy to do,watch the video i sent you.just go to Autozone and pick one up.then it will start every time and you won't have to wait till it cools off anymore.bad solder joint inside the relay on the green circuit board.most of the hondas do it.90-93 is the same part number,19236