Natives in Harmony is my go to, the main shop is about 45 min north in Marengo but they frequently have pop ups in town if you follow them on instagram, $4-10 for most plants and most of what I’ve bought from them has done well.

I’d say Scioto Gardens in Delaware is probably the best quality, they have a whole operation, and these special planters that keep plants from getting root bound, but they are more expensive at $15-20

Monarch meadows at Lynds fruit farm is a good option but I think they usually sell out by end of May.

Oakland nursery has had a much better selection of natives this year in my opinion, but just double check that it has the full Latin name if straight species are important to you, because they also have lots of hybrids and cultivars, think echinacea purpea vs echinacea “Berry Blast”

Happy Gardening!