Contact the company then they will tell you how much it is. http://www.sagernotebook.com/index.php?page=contact
I sent it in for them to figure out what is wrong with it and was more looking at if its possible to replace it myself because sager is saying the fix is about how much the laptop itself would cost.
If you know there is the MB problem, then you have to buy the new same MB, then watch the youtub to see how to replace the laptop MB. You can find other detail too. http://www.youtube.com/watch?v=XIRkeO_sJN8