This person is selling Frogfruit on Etsy and they're from Texas so that might help. Some people believe a species is a species but I know some native plant folks say you should stick with your local ecotype. Like how Monarch Watch only ships milkweed seeds gathered in your general area.
https://www.etsy.com/listing/1...
This Oklahoma seed seller is out of stock but you can probably call and see if they will have it again soon.
http://www.lorenzsokseedsllc.c...
As for Spanish Needles, well, I don't know how best to ship seeds, but if you tell me how to do it, I'll ship you some. I'm guessing the biggest threat would be moisture. No joke, I was picking those bad boys out of my leg hair today. (Shaving is hard with fibromyalgia. Not gonna lie; it's been a while.) In fact, let me rephrase. I will ship you so many you'll be able to plant a pasture. And they germinate so fast. I had Dad till the front section of the house so I could plant some pansies (for Mom), and eventually milkweed and I had Spanish Needle seedlings in three days! Grumble, grumble. And once you have them, they will self-seed themselves all over so keep that in mind.
I can see there not being much of a market because they're not exactly plants most people grow. Frogfruit is getting more popular and some people here are using it as an alternative to lawns because of its mat-like growing habit. As for Spanish Needles - most people here spend their life cursing and pulling them. They're one plant I can remember as a child because I used to do the "he loves me, he loves me not" thing with the petals.
