I've added a gadget to the left, a list with live links of Spring Garden Sales in the Seattle/Tacoma area that I plan to attend (and probably spend more money than I should). I thought this would be useful for any readers who also live in this area, as well as for me to keep track. Unfortunately I didn't realize when I was entering the list that they would appear in reverse chronological order, and there is no way to sort them (other than re-entering all of them). And the Northwest Flower and Garden Show is out of order completely, appearing right at the top of the list.
I've ordered some evergreen huckleberry and orange honeysuckle from the Pierce County Conservation District sale, and I think I may order from the King County one as well. King County is selling sword ferns, which Pierce County is not. I've found that Conservation District sales are very inexpensive, although you have to order in groups of five or ten (but the extras are useful for plant swaps). I ordered lots of bare root native shrubs from Pierce County last year, and they grew quite well. We'll see in a few weeks if they have survived this unusual winter.
I also bought lots of native plants last spring from the Native Plant Society sale, and was very impressed with the amount and variety of plants they had for sale.
If you're in either the Portland area or British Columbia, there is a list here that lists plant sales in your area, as well as the ones I've put in my list to the left.