Bundle of Holding's Shadowdark Compatible Bundle is a 7-item fixed price $18 package. Shadowdark ($29 PDF) is an OSR dark fantasy RPG.

The bundle is

• Belowdown - 112 pages, $16 retail, 19-level mega dungeon
• Dark Visions - 88 pages, $15 retail, three occult character classes -- Cultist, Inquisitor, Covenant Knight -- plus two adventures
• Tower of Six - 36 pages, $8 retail, third adventure to complete the trio started in Dark Visions
• The Devoured Labyrinth - 122 pages, $13 retail, 41 one- and two-page mini dungeons
• Horde - 174 pages, $10 retail, orc and goblin splatbook
• Hyborian Adventures - 83 pages, $15 retail, five REH stories made into adventures: People of the Black Circle, Queen of the Black Coast, Shadows in Zamboula, The Jewels of Gwahlur, and A Witch Shall be Born.
• Treasures from the Dark - 74 pages, $10 retail - 100 magic items

I like adventures and dungeons so Horde and Treasures not as interesting. That still leaves $60 retail in products for $18. I guess that leaves the problem that Shadowdark RPG is a bit pricey. Then again I have one Shadowdark adventure and the monster stats look to be closer to D&D 3E than Basic D&D so this bundle is still usable in other systems.

So a fairly tempting bundle and ended up buying it.