If you've recently purchased a print version of one of these products you may be eligible for a digital version. See if your friendly local gaming store is part of the Bits and Mortar program. If they aren't, it is easy (and free) for them to join!
Vast Grimm Core Book INB-VGB-001
Vast Grimm Volatile Verse 1 INB-VGZ-002
Vast Grimm Into the Wurmhole INB-VGZ-001