For 40 year old collectibles, they aren't worth as much as you would expect. I'm guessing they "book" for $2-$20 each depending on the player, if they are in nice shape. A lot of them went through the dishwasher, or were kept in sunlight, so many are faded or have graphics loss - these would have little value. Maybe some of you have bought or sold some of these more recently than I can weigh in.
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