They don't have a website, but this company in McMinnville, TN will send a paper catalog upon request. Name, mailing address & phone # is on the link below.
I believe they have all of the plants you mentioned and more.
All plants are shipped bareroot, but I have never had a problem establishing them.
Rb

Here is a link that might be useful: Dave's GardenWatchDog

There is a place called Bowman's Hill Wildflower Preserve (I think I got the name right) near Pgh that sells wildflowers. I haven't been there myself, but hear good things about it.

Thanks Rb and ladyslppr!

I took a chance and ordered from VIola wildflower in TN. I think a field trip is in order to Bowmans.

I am partial to mail order places that have a website but I will file away the McMinnville one to give to a friend so does snail mail.

Try ebay--I have purchased lots of trillium, hepatica and even ladyslippers. I have not been disppointed by the quality and the price is good.

ltmm: have you actually purchased lady slipper from the net and they came back? have been looing for private gardeners will to trade for some.

You could also try Gardens of the Blue Ridge in Pineola, NC (www.gardensoftheblueridge.com) - I have had pretty good luck with them. They aren't cheap (is anyone?), but the plants they ship are excellent quality, and they have a pretty good selection - mostly Appalachian wildflowers.