This is a little bit of old news but this was a really nice plant sale that my daughter and I went to in the spring. There were a lot of nurseries and clubs that were selling unusual and native plants. The people were knowledgeable and I even ended up joining there club and getting a few books to boot! Plus the Hardy Plant Society will have another plant sale this fall on Sept. 15th. You can never have enough plants!
Check this website: http://www.hardyplantsociety.org/events for more info!