Where do you buy your plants and seeds?

I'm putting together a list seed of companies and plant nurseries, and have reached the end of my rope, so to speak.

I'd love to know where you've bought stuff from?

Here's what I have so far:

Seeds:

Johnnies
Peaceful Valley
Bountiful Gardens
Territorial
High Mowing
Adaptive
Wild Garden Seed
Siskiyou Seeds
Strictly Medicinals (formerly Horizon Herbs)

Plants etc:

Lawyers Nursery
One Green World
Burnt Ridge Nursery
Bob Wells Nursery
New Farm Supply

I buy my seeds from our very own Joseph Lofthouse. I couldn't be happier with them and am getting ready to order more.

Evergreen Seeds http://evergreenseeds.com/
Southern Exposure Seed Exchange http://www.southernexposure.com/

My additions to the list

Seeds -  Online from Baker Creek, Annie's Heirlooms
            In stores from Renee's Garden, Botanical Interest

Plants - Raintree Nursery

My go-to is now Joseph Lofthouse. His stuff GROWS.

Lots of places!

Those I got seed from last year:

I was and am so excited by Joseph Lofthouse's work that I sent him probably my biggest seed order ever last winter.
The local seed movement has spawned a local seed co-op here called triple divide. They don't sell much online yet- but you should look for your most local co-op or small seed company.
The local seed library.
The local farmer's market- I bought three squash, some beans, two tomato plants, and some popcorn all with the intent to save seed last year!
Sandhill Preservation Center
Adaptive Seeds
Online trading partners- I got some amazing things swapping seeds online last winter.
Backyard Beans and Grains / Resilient Seeds
Seed Racks especially from certain companies like triple divide seed co-op and irish eyes garden seeds- which still carries some of the old Garden City Seeds varieties a company they purchased.
The bulk bins at my organic grocery- especially when the seed has a sticker that says "local" or "Grown in Montana"
Family sometimes gifts me seed. I plant it and try it out.

The most important source though? The tried and true, seed saving from my own garden. Quantity matters and so does seed quality. If I save my own I control both. Also I can save and replant seeds from vegetables I've tasted. I planted all the seeds out of a Hidatsa squash I grew last year that was allowed to open pollinate. Now I have dozens and dozens of its offspring Hidatsa squash crossed with Rio Lucio a squash I've grown since about 2000. The cross is fun and it tastes good. Next year's F2 will be fun. What's more I know I like it. If I had grown only Joseph's squash I would only have 1/3 of the squash I have now? Why? Joseph sent generous seed packets, but there are a lot more seeds in a squash than in a seed packet or 3 or 4 seed packets! I have numerous Lofthouse squash on my seed saving pile. I've eaten one so far- a Lofthouse buttercup. Definitely planting a lot of it next year- and I will be able to because I saved the seed myself! Note: more important than Joseph's seed is his ideas!

Awesome, thanks everyone!

I know it's a big company but baker creek is good good germination good sized packets. I don't like pityful seed portions that means I son't really like strictly medicinals and bountiful gardens. Hudson, terrible outdated webiste but good germination. I look at garden watchdog ratings.

seed:
Baker Creek Heirlooms
Kitazawa seed Company
The seed saver's Exchange

Mushroom spawn:
Fungi Perfecti

Potatoes and Onions starts:
The hardware store in town

Seeds:  Joseph Lofthouse

Onions: Dixondale (very happy with how well they do compared to starting from seed myself)