Realcent.org

Does anyone have any idea how many people sort for silver in the U.S. I am in San Diego and whenever I bring in a box of halves to the bank they either act stupid or really just have no idea why I have halves or what I am doing with them. Since I do live in one of the biggest cities in the nation and no one seems to have a clue I am guessing that the # of sorters nationwide is very low. Anyone have any thoughts regarding this?