Geri B, I am in the Thumb of MI and got 4 plants in the herb section of my farm market/nursery. I put them in tubs and they grew 3' tall and are on VERY sturdy stems. I let them grow until a frost was coming and cut the stems so the leaves would dry down naturally. Then strip them off and crush them to store in jars, I vacuum seal them for longer storage. I just put in blender for a smoothie, my current supply is from 2013 so best plant some this year. I might try to powder some but it will still be green, would get a lot more in a jar if in powder form.
I use Truvia for all my jams and cooking for things that are NOT green. Try a plant and see what you think from there.
Edie, I have never looked for seeds but the plants paid off very well for me.