There is an exchange for native plants if you're interested in native jacks and trilliums.

Contact me in the spring...I have baby jacks all over the place...! I could spare a few! April

Try Munchkin Nursery. Be aware that if you find 'cheap' native plants they are probably dug up and not nursery propagated.

Check rockislandwildflowers.com for many native plants, including Trilliums & JITP's.
Another source for Trilliums and JITP's is Eco Gardens, Decatur, GA. e-mail Don Jacobs at: eco_gardens@msn.com for a list.
He propagates and grows almost every species of Trillium in the world, plus many variants of those and all of the native species of Jacks.
Rb

If interested in trading, contact me a little later when both of these are up.

plantbug

Thanks to all who answered! - plantbug and ahughes798, I will get back with you later in the spring.

Also, Munchkin Nurseries turned out to be a nice fern source for me.