Books!

I was looking for children book online. Since we are in Netherlands, I looked for the books from ebay.co.uk. I must say that, 2nd hand books are cheap. But, the postage can be double the price of the books. I bought the following Disney story books few months back. Total 12 books cost me around 11 pounds, including postage. All books are in good condition, I wonder how come they children can keep the book in such a good condition leh?

Expensive? Do you have any recommendation where else I can buy children books online?