This is a group of all of the Level 2 books now available, 40 in all. You receive an extra discount on the shipping as you are charged as only 1 book instead of 40 books. That in itself is a savings , plus the savings on the discounted price of buying all 40. The regular price for 40 books would be $398.00 and we have these priced at a 10% discount. Making the total discount of over $50.00(That's like getting over 5 books for free).