A while ago, I saw a post recommending people who wanted to try planting milkweed to use a tool that lists nurseries that source local seeds rather than ordering from a national place. This suggestion was made because many plants are fairly well tuned to their local climate. Even if you don't intend to plant milkweed, I think this is a good tool to find a semi local supplier that cares about local heritage breeds. Most of the ones I checked take online orders and will ship. I'll shoutout Southern Exposure Seed Exchange and Sow True Seeds.

https://xerces.org/milkweed/milkweed-seed-finder#mwf_tool

The other resource I really love is a college near us has a good botany program and they put on two plant sales a year. Their prices are good, but the quality and selection is what really stands out. Plus most of the volunteers are students or faculty so when you have questions they either have a good answer or can walk you over to someone who does. That hasn't always been my experience at nurseries. I think it would be worth checking if any universities somewhat near you have a horticulture extension office or public gardens program. Try searching for botanical gardens in your preferred maps app and see what shows up.

One last recommendation that perhaps doesn't fit a houseplants community, but you got me monologing... John Scheepers/Van Engelen is my go to supplier for flowering bulbs. They import direct from holland and ship out to customers very quickly after the container arrives. The quality and size of bulbs I've gotten from them greatly surpasses any retail place I've tried.