Hi Nikaya! It's unlikely that will ever happen. Roll20 and Wizards of the Coast are two different entities. The closest I can think of that is the Paizo discount on PDFs for digital purchase on Roll20. Probably because there is no material cost involved, and there is only one retailer for each—easier to track. How would Roll20, or even Wizards of the Coast know you had purchased a hardcover unless you had purchased it directly from them with a digital receipt? And in any case, even though the content is the same in terms of art and words, they are vastly different in their production. The usual metaphor is that owning the book for the Fellowship of the Ring would not grant you a discount on tickets to the movie adaptation. Work went into each version, and by different groups of people.