I am not sure how it works out for shipping to US, but right not, they are having promotions for mega packs which works out to very attractive savings for my friends in Asia if they order 2 mega packs (not exceeding a certain weight). U can email them and find out more. Also when u add the items to the cart, u can see the shipping price changes to decide how much it worthwhile.

http://clubs-shop.scholastic.co.uk/products/76103

http://clubs-shop.scholastic.co.uk/products/74108

http://clubs-shop.scholastic.co.uk/products/74622

http://clubs-shop.scholastic.co.uk/products/73589