Until August 28th, 2017 you can still purchase a Lifetime Senior Pass for USA National Park System for a total of $20.00, ($10.00 PLUS $10.00 PROCESSING).
This allows you and peole with you in the same vehicle NO cost access to any National Park System that charges admittance. It provides additional discounts when in the park..........see information on the website.
When you use the link scroll down for what the card provides and then click on to purchase a Lifetime Senior Pass for USA National Park System.......