The books all go for fairly cheap on Amazon. Looking at $4-5 USD average. The bulk of the lore is contained within. Some highlights I would recommend being sure to read in conjunction with all the comics saved to Biomedia Project would be Chronicles #4 Tales of the Masks, Adventures #3 The Darkness Below, Adventures #6 Maze of Shadows, Adventures #10 Time Trap, Legends #4 Legacy of Evil, Legends #8 Downfall, Legends #11 The Final Battle. If you want to skim, stick with the comics as suggested, if you want a healthy dose, read these suggestions in conjunction with the comics (note that several comics reference events in the books, so you may want to read the books referenced that I did not mention), if you want to be a sage, read the comics, books, and serials in order. But if you want to be a lorebeard, read the Early-Reader books as well.