Been tracking Maberry's stuff for years, and honestly, your options have never been better for digital access. If you're talking brand-new releases, your first stop has to be the major retailers like Amazon Kindle Store, Apple Books, or Kobo. They get the eBooks on launch day. For audiobooks, check Audible; his 'Joe Ledger' series narration is top-tier. A lot of people sleep on library apps like Libby or Hoopla, but I've snagged his latest titles there without spending a dime—just need a library card and some patience on the waitlist.
He's also been putting out some cool, more niche stuff directly through his own website or via publishers like JournalStone. I picked up 'Ink' there before it hit the wider market. For serialized fiction, keep an eye on platforms like Substack or Patreon; some authors are experimenting there, though Maberry himself isn't super active in that format yet. His social media, especially Twitter, is where he'll often drop early announcements about where a new story is popping up.
Just a heads-up: avoid those random 'free PDF' sites. They're usually scams or pirated, and they don't support the author at all. The legit routes are reliable, have better quality, and actually get him paid for the wild horror-thrillers we love.