Promo Code: Bulk Discount for Purchasing from a Series SD484
As a site visitor let me use a promo code to get a bulk discount when I purchase a bunch of items from the same series (e.g. books in the Day Hiking series or backpacking courses/clinics). So we define "series" as any group (or bundle) of items of any kind (books, courses, etc.) that have to be in the cart for the discount to be applied.