@boomerang,
Books were one of the chief ways we shared information 20 years ago. In 20 more years, I doubt that people will have books (i.e. glued together stacks of printed paper) at all except as antiques.
Times change.
Books are a now a commodity. They are cheap and easy to get. A good new child's paperback can be purchased for $5. Our favorite hardcover picture books "D'Aulaires' Book of Norse Myths", sells new on Amazon for $16.47 (the price of a normal dinner at chain Restaurant in Boston).
This doesn't mean that you shouldn't buy books for the school. My daughter's school generally asks for books on a theme or to meet a specific needs. They are requesting access to the information in the book, the stories or the theme, rather than the glued together paper.
When you buy books you are buying a commodity. The paper the books you are buying is made of is inconsequential. What matters it the experience you are giving to the readers.
As the needs of the students and the schools community change, the paper becomes worthless.