Artist & Craftsman Supply knocks 10% off if you show them your Artfest class description at checkout! Besides the Seattle location near the University of Washington campus, the company has 17 other locations scattered across the country. The staff vibe is kind of like that at an old hardware store: friendly but not perky, knowledgeable, and efficient.
And oh, the venerable supply wonderland that is Dick Blick. Did you know they're having a winter back-to-school sale right now? Yes, right-now right now. You have until February 26th to get your butt in gear. (It's in-store only. But they do have some winter discounts for online purchase too.)
Neither store is paying me to tell you this. I just wanted to remind you to bring your class descriptions with you -- it's like a coupon if you use it in certain stores. Off you go now.