| Source | Format | Cost | Notes | |--------|--------|------|-------| | | EPUB/PDF (DRM-free) | Subscription or per-volume | Best for simulpub series. | | Kobo | EPUB (Adobe DRM) | Pay per volume | Can remove DRM for personal backup (where legal). | | Amazon Kindle | AZW3/KFX | Pay per volume | Can convert to PDF (personal use). | | BookWalker | App-based reading | Pay per volume | Often has sales. | | Google Play Books | EPUB/PDF (Adobe DRM) | Pay per volume | Native to Drive ecosystem. | | Humble Bundle | DRM-free EPUB/PDF | Pay what you want | Occasional LN bundles. |