Great idea!
Bullock Brothers Permaculture Homestead - Orcas Island, WA - as John S. mentioned, very worth the drive and the challenging ferry availability (ferries on weekends get FULL - you have to get in the queue several time slots ahead) for their plant sales and tours or workshops. Over 20 years of established
permaculture food forest systems, off-grid living, chinampas, and more.
Inspiration Farm - Bellingham, WA - yes, this is Brian Kerkvliet's place as John S. pointed out, and IMHO, it is quite inspiring, too. Biodynamic and permaculture systems. They have a market stand right at the entrance to their farm and often have produce, especially awesome garlic, for sale.
Next, I'm going to list some farms I've enjoyed supporting and why, even though I moved to Montana a year and a half ago, and even though most of these are not quite permaculture by some definitions. I'm sure there are dozens, if not hundreds more of examples like these that are not quite permaculture (yet?).
Full disclosure: I provide accounting services for some of these farms (who shall remain nameless).
The Root Connection - Woodinville, WA - now the oldest CSA (community supported agriculture - where customers/members pay for a "share" of the season's harvest and pick up or receive produce usually on a weekly basis) in the nation, started in the '80's. While they might not be quite veganic, they are definitely organic (though perhaps not certified) and stopped using horse manure that had antibiotic residue years ago. I think they have a CSA drop site in Seattle.
Jubilee Biodynamic Farm - Carnation, WA - besides being a biodynamic CSA, they have added in animal systems to further close their nutrient cycle loops. They had planted a perennial/permaculture food forest at the river's edge that unfortunately was destroyed by flooding. Lots of support at this place for other farmers, for repairing the mismanaged river watershed, and organic/sustainable methods. I'm not sure if they have a Seattle drop site.
Local Roots Farm - Duvall, WA - organic (but not certified) CSA, honor market stand in Duvall, plus sells to restaurants and at the Queen Anne and Broadway Farmers Markets. Awesome family run farm that uses plenty of human labor over machine labor and some of the most beautiful produce around.
First Light Farm - Carnation, WA - organic (but not certified) you-pick and farm stand in Carnation, with "mini-farm" and educational opportunities and an incredibly picturesque location in the Snoqualmie valley.
Oxbow Farm and Education Center - Carnation, WA - another high-quality organic (not permaculture) farm, but with CSA drops in multiple locations and usually designed in a way to foster community building interactions at the drop site. Also sells at multiple farmers markets and provides food to many restaurants that feature local and organic food.
Cascadia Edible Landscapes - Seattle, WA - this is the first CSPS, community supported plant starts, or plant start CSA farm I've ever heard of! Awesome idea for more urban areas. Their edible landscaping services focus on
perennial,
sustainable systems. They also have off-shoots involving eat your
yard community activism, food justice, and education, to name a few.
Dog Mountain Farm - Carnation, WA - this is one of the first CSAs in the broader Seattle area (that I'd heard about any way) that is offering "whole diet CSA" options. They also have some very diverse farm income models including farm dinners, farm stays, education, in addition to the variety of CSA offerings.
21 Acres - Woodinville, WA - now growing much of the produce it sells, locally renown for its platinum LEED center with the first officially permitted composting toilets in King County (if I recall correctly). Organic, though not certified, some permaculture systems, apiary, market includes other value added high-end items that meet stringent standards, including only coming from a 300-mile radius, plus loads of educational programs with a lovely teaching kitchen and facilities.
The interesting thing is that you don't always find your most local farms at the local farmers markets. The CSA model, or selling directly to restaurants, works far better for many of them.