Amazon prices for uncommon/rare items can get wierd. There was an issue a while ago with resellers that would look for items on amazon, and create a duplicate

Amazon prices for uncommon/rare items can get wierd. There was an issue a while ago with resellers that would look for items on amazon, and create a duplicate listing with a slightly higher price. If they got an order, they could buy the item from another amazon seller, and onsell the item for a profit. This broke in a predictably amusing way when there were only a few vendors for an item, and all of them were doing the same thing - each vendor updating their price to be higher than the others, quickly spiralling up to ludicrous values.