If you purchase 1 book you can use the Promo Code, BUY1, at checkout for a 10% discount.
If you purchase 2 books you can use the Promo Code, BUY2, at checkout for a 20% discount.
If you purchase 3 books you can use the Promo Code, BUY3, at checkout for a 30% discount
If you purchase 4 books you can use the Promo Code, BUY4, at checkout for a 40% discount
If you purchase 5 books you can use the Promo Code, BUY5, at checkout for a 50% discount.
Shipping is $2.75 per book