A typical book costs around $14-$15, though I have seen some cheaper, and definitely some over $20, sometimes even $40. At least that's how it is around here. Books are pretty expensive for me, so I don't get them much. That and I rarely find a book that catches my interest. I never bought a book for logic, although I will try to buy an animal book for the pictures to help me with my drawings and to inspire some new characters and designs.