Don’t buy seeds on Amazon, eBay, Etsy, etc - they are so full of scammers that it is impossible to weed out the legitimate sellers from the fake. And if you get fake ones, you may get invasive species that are harmful to the environment around you.

Most places have some great local sellers. But if you’re buying online I would recommend dedicated places like Canada’s Vesey’s Seeds, West Coast Seeds, or the US’s Prairie Moon