Another possibility would be yet more checkboxes for "specializes in".
PNW seeds
Southern vegetables
Northern (cold-hardy) flowers.
After all, if "Location" is the location of an online store, they might not specialize in that region at all. For example, where is Parks' corporate location?
However, at some point, there might be too many check boxes. Maybe, maybe not.
Territorial Seeds - Vegetables West of the Cascades
Ed Hume Seeds - short season and cool climate areas. ... high altitudes and early or late planting in warm climates.
Southern Exposure Seed Exchange - Mid-Atlantic and Southeast,
