seedsavers.org (but they are usually sold out by now.) anniesheirloomseeds.com
edenbrothers.com
And rareseeds already mentioned on this thread.

Avoid Burpee as they have a division controlled by M*nsanto.

I've seen a lot of seeds in natural food stores this year. In some states, if not all, they can be purchased with SNAP (food stamps.)

The four I have mentioned above I have bought seeds/plants from for many years with great success, harvesting the seeds to replant for the following year.

#MAGA

just ordered from edwnbrothers, thank you!

And Cuttings for Apple Trees.. I have raised many thru the years.

Seed tips: Only open pollinated (OP) seeds will produce seeds true to type. Hybridized seeds, which are the majority for sale in most stores, DO NOT produce viable seeds true to type. and many are GMO based too. Most commercial seed Co's do not want you to save your own seed, since they cannot sell you more each year.
Seeds are living things and have a viability range anywhere from 1 to 10+ years or more depending on type, i.e. lettuce 3-5 years. Storage is crucial,, store in fridge or freezer for longest life, seeds must stay dry. canning jars are excellent for long life storage but open jars couple times a year to let seed breathe, they are living! Also, many seed types will be in dormancy and will not germinate unless dormancy is broken, putting fresh seed in fridge for a week will break dormancy, lettuce will often not germ without this for example.
High Mowing Seed is excellent quality and all (OP) open pollinated, and organic
Wild Garden Seed in Oregon is excellent too.

Bless You thank you for helping us rely on ourselves and Nature, by learning and knowing the best methods.

Great info! Thank you.