For US teachers only, the Scholastic Teacher Store offers the 50-Book Collection for Grades K-2 (pictured) for $178 or Grades 5-6 for $240. Coupon code "BOS" cuts each to $50. With $4.50 for shipping, that's $1.09 per book, tied with our mention from a week ago, and a very low price for this quantity of children's books. The selection of books in each collection is random.