Please note, I use the term, "FAQ," loosely to include the, "About Us," section. It's my shortcut for information. In any event, you can find it here
https://exchange.seedsavers.org/page/about#seed
If you scroll down, you'll see the following:
Over 13,000 members share homegrown seeds with one another through our seed exchange. The seed exchange is available online and in print to encourage seed savers of all generations to participate. Members from across the world share their seeds, and Seed Savers Exchange offers many varieties from our own extensive collection. In 2015, the exchange featured over 23,000 listings. Anyone can browse the exchange online, but only members can request seeds.
To reach gardeners outside our own membership network, we also publish an annual seed catalog featuring over 600 varieties. Anyone can request a free catalog or shop for seeds. When combined with memberships and donations, seed sales enable us to pursue our mission of preserving and distributing heirloom seeds.