For mummies with babies below 18 mths, where do you buy storybooks? or do you borrow from library?

I used to get board books secondhand from Carousell or hand-me-downs, usually don't like spending on them because books are so expensive! Then I brought my LO to the library when he was a little older (probably 16-18mo or so) and we started borrowing books instead - just 2-4 books each time and I always clean it before letting him read at home! As for library visits (in fact, every time we went out before he turned 18mo), I'd change his clothes and let him sanitize his hands after playing/visiting the library.