From DB Members, take 40% off of all Marketplace items from now until January 2! When I saw all marketplace items, I thought, too early for the xpac to be on sale but 40% off everything in the store would include xpacs. Don't see a discount on it. Confirming the 40% off is "almost everything" in the marketplace rather than ALL.
I think by marketplace they mean things that can be purchased with DBG cash directly from the marketplace. Expansions, account time, and krono are listed on the marketplace but you are directed to the website for purchase of all 3 so they are not "technically" marketplace items but just advertised in the marketplace if that makes sense. All 3 of the above have their own special sales from time to time and they will advertise them specifically when they do so.