A community about limited-time offers that bundle several products together, as popularized by the Humble Bundle.
Bundle of Holding: Malhavoc Arcana Bundle
Malhavoc Arcana
bundleofholding.com
Two tiers, $7.95 and beat-the-threshold. All are d20 books.
For $7.95, receive Beyond Countless Doorways, Hyperconsciousness: Explorations in Psionics, The Book of Iron Might, Demon God's Fane, and The Temple Of Mysteries: In Media Res.
For beating the threshold ($20.17 as of this writing), add Arcana Evolved, Transcendence, Spell Treasury, and Legacy of the Dragons.
All are available as DRM-free PDFs. Most (not all) Bundle of Holding PDFs are also available through RPGNow.




I might back it at the minimum level just to pick up Beyond Countless Doorways, the Planescape book.