You can actually pay $0.01, you just don't get anything for it. So "pay what you want" is true, you can pay $0.01. But if you want to get the books, you have to

You can actually pay $0.01, you just don't get anything for it. So "pay what you want" is true, you can pay $0.01. But if you want to get the books, you have to pay at least $1.