The greatest bargain for anyone 62 or older is a National Parks Pass allowing its recipient and a guest or guests into any National Park for free for life, for a one-time purchase price of $10. For instance, purchase one at the C&O Canal Towpath parking lodgment for the Billy Goat Trail in MD and you will be able to pre-pay for the parking fee and individual entrance (both free thereafter) for the $10 card, which will save you money for that trip on the spot.
I received a card at my retirement party when I was retired from my agency last year after a quarter-center of service. I value the card more highly than I do the small statue I received of the agency's distinctive statue outside its entrance, which I also like for memory's sake.
This card has a lot of utility. Visit the second most spectacular site in the US that I have seen, Crater Lake in OR, for free.
Or visit the most spectacular site in the US that I have seen, the Grand Canyon, with the card. But the price for the bargain is going up eight-fold soon, so act now if you are eligible.