I was and am so excited by Joseph Lofthouse's work that I sent him probably my biggest seed order ever last winter.
The local seed movement has spawned a local seed co-op here called triple divide. They don't sell much online yet- but you should look for your most local co-op or small seed company.
The local seed library.
The local farmer's market- I bought three squash, some beans, two tomato plants, and some popcorn all with the intent to save seed last year!
Sandhill Preservation Center
Online trading partners- I got some amazing things swapping seeds online last winter.
Backyard Beans and Grains / Resilient Seeds
Seed Racks especially from certain companies like triple divide seed co-op and irish eyes garden seeds- which still carries some of the old Garden City Seeds varieties a company they purchased.
The bulk bins at my organic grocery- especially when the seed has a sticker that says "local" or "Grown in Montana"
Family sometimes gifts me seed. I plant it and try it out.
The most important source though? The tried and true, seed saving from my own garden. Quantity matters and so does seed quality. If I save my own I control both. Also I can save and replant seeds from vegetables I've tasted. I planted all the seeds out of a Hidatsa squash I grew last year that was allowed to open pollinate. Now I have dozens and dozens of its offspring Hidatsa squash crossed with Rio Lucio a squash I've grown since about 2000. The cross is fun and it tastes good. Next year's F2 will be fun. What's more I know I like it. If I had grown only Joseph's squash I would only have 1/3 of the squash I have now? Why? Joseph sent generous seed packets, but there are a lot more seeds in a squash than in a seed packet or 3 or 4 seed packets! I have numerous Lofthouse squash on my seed saving pile. I've eaten one so far- a Lofthouse buttercup. Definitely planting a lot of it next year- and I will be able to because I saved the seed myself! Note: more important than Joseph's seed is his ideas!
I know it's a big company but baker creek is good good germination good sized packets. I don't like pityful seed portions that means I son't really like strictly medicinals and bountiful gardens. Hudson, terrible outdated webiste but good germination. I look at garden watchdog ratings.
Potatoes and Onions starts:
The hardware store in town
"Of all the beings that exist, man is only one. Among all the Millions of men on Earth, those that live by farming are only a small portion. smaller still are those that have office or wealth and ride in carriages. Of all these, a man on a carriage is nothing but a fleck of hair on a horse's flank."
Onions: Dixondale (very happy with how well they do compared to starting from seed myself)
"Hundreds of years from now it will not matter what my bank account was, the sort of house I lived in or the type of car I drove... But the world may be different because I did something so bafflingly crazy that it becomes a tourist destination"
Good heavens! What have you done! Here, try to fix it with this tiny ad:
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