I sell metal reproductions (now there are a few others doing the same) ,I think Val Sarrento made the 1st repro's, I started the ball rolling again a few years ago, the copper and aluminum coins from 1959 through 1969 are the recessed flat coins that I offer.
Your talking about what are usually called buttons, they are plastic and are not knock off's, I don't think they are offered for sale new anywhere, best bet is here or ****
Good luck and Thanks to everyone for their support
Kurt