These are plant nurseries, garden centers, plant shops, and plant retailers where you can find North Creek Nurseries plants available in your state or by mail-order/online ordering.
The Native Plant Society of New Jersey offers a comprehensive guide for residential rain gardens in PDF format. Great information here!
Hope you enjoyed Carrie Wiles' Rain Gardens presentation at the Philadelphia International Flower Show on March 6, 2012. Here is her list of species recommendations.