There are a couple of things to look into with circuit boards.
Most of them that come out of TV/Monitors, DVD,VHS,Satellite Receivers, are considered "low grade" and don't have the value of the ones that are being "flaunted" on EBay. MAKE sure you are buying are selling those that come out of PCs that REALLY have gold in them.
BTW, most of the time, you can get more for them on EBay, than through smelters.
Your low grade boards still have a fair amount of copper etc. in them, so don't give them away cheap.
Good Luck!