My haul so far:
Missouri Wildflower Nursery
Stokes
Horizon Herbs
Prairie Moon Nursery
Pinetree
Botanical Interests
I have to admit though, 99.9 % of my purchases these days are on the WWW. I can recall fondly the days before the Internet when I spent hour upon hour drooling over the catalogs. And sending in a huge order for maybe 15 $.