New print-on-demand products for today are listed here:
D&D Classics Thread of DOOM! - Page 87The oldest item is one of the Thunder Rift modules, Assault on Raven's Ruin. A good choice for print-on-demand because of the fold-up minis and poster map, which are often missing from second hand copies and drive up the prices. It will be interesting to see how they handle these. Will they be bound directly into the product? If so, you'll have to cut out several pages from your printed copy to use them. The pdf scan looks nice but doesn't show the minis or map.
Also two 2E products I'm not familiar with.
Zenopus Archives
website &
blog: Exploring the Underworld of Holmes Basic D&D.
Holmes Ref: Reference Sheets for Holmes Basic Referees, also compatible with OD&D plus the Greyhawk supplement