Take a good look at it and make sure that the glass isn't starting to delaminate( pulling away from the foam) pressure dings are alright. Take a good look at the fins and make sure they are not cracked and don't wiggle. Look at the tail, rails, and nose make sure there isn't a spot for water to leak in. Glassed in fins are alright but you are stuck with them. Repaired dings are alright. Make sure thay are smooth and water tight. How tall are you and weight? Make sure the board is thick and wide enough for you. $125 is a decent price if they board is in ok-good shape. I have seen some roached boards for more.
Board More/Work Less!