Currently, the Bundle of Holding has a great deal on a whole bunch of Dungeon World books, including my own Class Warfare, Adventures on Dungeon Planet, Truncheon World, Terrors of the Ancient World, and all three of my DW series modules: Lair of the Unknown, Island of Fire Mountain, and Ghostwood Haunts.
It also includes two great adventures from Jason Lutes! Funnel World is basically the DCC funnel adapted to Dungeon World. You play much-maligned peasants trying to survive the onslaught of terrible monsters long enough to become bonafide adventurers. The other one is Servants of the Cinder Queen, in which an evil fire goddess and her minions have invaded an ancient mountain monastery hoping to wreak havoc on the world. Or something like that. I haven’t read either of these yet, but I have played both of them, and my current Dungeon World group is still playing Cinder Queen. They have both been a lot of fun.
I have also marked down all the print versions of my books in the Bundle by 15%, from now until sometime after Christmas. So check out the Bundle and give the pdfs a read, and if you like them a lot, pick up one or two of them in print. If you shop at Lulu, the code FJE5 gets you (an additional) 25% off, today only (December 11). There might be a better deal later this month, though, as there was last year (although the deal last year seemed pretty crazy, so who knows).