Amazon have decided that they can no longer hold their printing costs at the current levels. That's bad news for anyone who uses them to print and distribute their rulebooks. Like us. As we've always adopted as policy of selling our rules with as small a margin as possible, alas we are going to have to pass this on to anyone buying the rules. That's because some of the books no longer make enough money for Amazon to take their royalty.
However, they have given us a few weeks' notice, so at least you can order all those rulebooks you've been putting off until you had a good reason to buy them. Well, now you have. Saving money.