This guidebook gives you extensive details on the hostels in North America. It is filled with pages of photos, maps, attractions and activities. Receive it by mail upon request or pick up a copy at any hostel. Pay the discounted member rate. When you present your HI card at any HI hostel you are entitled to the special members' rate.
Members also get discounts on attractions, food, car rentals, etc.
Just look in your HI guidebook or ask the hostel staff. Most hostels provide bulletin boards or leaflets detailing discounts in their area and some even sell discounted tickets at the front desk. Also, many hostels and HI offices maintain retail locations. In the U.S. they are called Travel Centers. They sell backpacks, guidebooks, and travel supplies.