silver half dollars

These are all fairly worn, and half dollars aren't terribly rare. Most of their value will probably come from their silver content, which I believe is around 80%. Current spot price of silver (as of writing this post) is around $15 an ounce. Multiply that by .80 and then again by the weight of the coins in ounces and you have your value. Smelters will give you different buy prices but generally expect to get 75 cents on the dollar. Hope that helps!

silver coins have been sold

these are referred to as "Walking Liberties". they contain 90% silver. you should have no problem getting $8-10 for each one