I used to create a list of native plants sales in the area. It was a lot of work. Thank goodness the Pennsylvania Native Plant Society has started listing the sales.
I also included a list of books on native plant gardening for the United States and Canada.
Here you go.
Free Plant Lists on My Blog
Books on Gardening with Native Plants
Spring Wildflowers of the Northeast: A Natural History by Carol Gracie
Native Plants of the Northeast: A Guide for Gardening & Conservation by Donald J. Leopold
Native Plants for New England Gardens by New England Wild Flower Society
Gardening with Native Plants of the Pacific Northwest 3rd Edition by
The Drought-Defying California Garden: 230 Native Plants for a Lush, Low-Water Landscape by Greg Rubin and Lucy Warren
Landscaping with Native Plants of the Southwest 2nd Edition by George Oxford Miller
100 Easy-to-Grow Native Plants for Canadian Gardens by Lorraine Johnson