Hello friend,
I think before this question can be answered, you need to find out some more info about this board.
Another question for you is what are you planning to do with this board.
What is the Model #?
How old is it?
Is it a powered board?
DOES IT WORK?
Once you get more info on it, I would recommend doing a search on eBay or some place like that to get a ball park figure.
I would also recommend that you see it, try it, touch it, play with it, etc....
Since this is a friend of yours, ask him if you can try it out for a little while before deciding to bye it.
Based on how you answer my question of what you're going to do with it will determine if you even need to bother with it.
I hope this helps
Peace
Joe