I did a search for "washington nursery trillium " and found the site below. They have a few varieties but I think you plant the bulbs in the Fall.

http://www.bigdipperfarm.com/cross_ref_c5.htm

Julie at Shadylane in Kalama might be able to help you. She will be the speaker at my Garden Club meeting in Kalama on the 6th.

Here is a link that might be useful: Shadylane Kalama Washington

Go to www.nwplants.com

It is a good place for trilliums and other natives.

Naylor Creek (located in Chimacum, WA) is a very highly rated, mostly mail order nursery that specializes in shade lovers. While their reputation has been built primarily on hostas, they offer a huge selection of other shade perennials, including a pretty wide selection of trilliums. They are open to the public and very well worth the drive, but call ahead to make sure they are there - they travel a lot to plant sales and shows.

Trilliums grow from rhizomes and are most often sold in spring as planted starts or bare root. Make sure you get propagated and field raised plants and not wild collected - many native trilliums are considered endangered species in the natural environment. IME, they tend to be plants that are in rather high demand and sell out rapidly - the crop at my nursery didn't even last a full week before it was gone - so you might even be a bit late for this season. My own trilliums have been in bloom for about a month.

Scroll down on the link until you reach the trillium section :-))

Here is a link that might be useful: Naylor Creek Nursery

In Tacoma, the Portland Ave. Nursery and Gartenmeister are two of my favorites. In the late fall and early spring, you can usually get great deals on them too.

Thanks, everyone, for the trillium info.
Some of these places I knew about, some I didn't.

I have a couple of trillium and they were SO pretty this year that I decided I wanted more. And after checking out the websites you recommended, I have now decided that I want more of our Western Trillium. They remind me of walks in the woods when I was younger.

Thanks, again,
Daphne

If you fell like coming over the Narrows Bridge our Native Nursery sells them, even blooming ones. They are huge. Check out the place, they have lots of other cool stuff too.

They have really strange hours, so check the hours before making the trip.

Here is a link that might be useful: Woodbrook Nursery

Do you still have trilliums out your ears? I'd love to figure out some trade!