Sahara Coins has blocked bidders that signed the Slab-Free pledge. I'm pretty sure that the owner stated this fact on the chipboard a few years ago. I tried to bid and e-bay said that the seller was not accepting bids from me. What a fool; blocking bidders and getting lower prices for some items. I can tell you that 2 of the items in Don's post would have gone higher if my bids were allowed.