Search "Heirloom Seeds" on ebay. More offerings than you can count. Example below.
If you buy a selection every year to have "fresh", even if you don't plant them, it is the best barter/growing insurance thing you can have if DC ruins us all and things go to crap. Cheapest insurance you can buy.
"If you are prepared, nothing will happen". Old saying, that I just made up. But, it's true.