where to sell books for cheap

hi, i live in the bangkok area and im looking for a place to sell my old books. i have IGCSE books for chemistry, physics, etc, but also reading books for teenagers. i don’t need them anymore but i did spend quite a lot on them so i’m hoping to get maybe around 100-200baht per book. if anyone knows any suggestions as to where i can sell them please lmk :)

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