Own physical copy of modules, any way to import into roll 20 with ease?

I own the modules for the curse of strahd and Dungeon of the mad mage, I was running both games in a physical setting and was wondering if there was any way I could import the maps without having to buy it again on the virtual marketplace. I tried to import a scan of one map from online but I had difficulty getting the scale of the map right and getting the units to match, any help or suggestions greatly appreciated

Within your own game, and presuming you are not charging, you're pretty free to use whatever resources you own. That being said, it takes a lot of work to convert everything to digital form. I believe you can buy the maps for Castle Ravenloft  on the Marketplace separately.