Purchase Compendium-Only Content Packs?

Hello, I love that we can upgrade our D&D 5E OGL compendiums through Roll20 by purchasing digital editions of the PHB, Monster Manual, etc., but is there a way to just buy the compendium content for them? In other words, when one purchases the PHB through marketplace, one pays the (currently) 29.99 for the digital edition of the book, the compendium add-on, and character art assets. Is there a way to just purchase the compendium add-ons for these volumes? I'm happy to support our gaming companies and communities, but I don't think we should have to pay for the books twice (I have them all in hardcopy), just to be able to use the game-specific content in the compendium on Roll20.

It's two completely different stores.  Just because you have the physical book doesn't mean anything to Roll20.  They don't get a cut of book sales.

I think you'll find that the PHB is basically just a big compendium. You aren't receiving a PDF version to read or anything like that. There isn't really anything to separate out - the entire book IS the in game compendium, with drag and drop items etc. You can view it outside of the game, but you are just viewing all the compendium info in one spot, as opposed to in-game where you are searching through it.