Puget Sound, Spokane and the Tri-Cities
Washington's shops are heavy on Magic: The Gathering and in-store play, and fewer of them list sports cards. Most are game stores that also sell Pokémon.
Puget Sound has the most choice, from Bellingham down I-5 through Everett, Seattle and Tacoma to Olympia, with more on the east side in Bellevue, Renton and Kent. Sports-card shops are thinner on the ground, with one apiece in Bellingham, Renton and Tacoma and a few in Seattle.
East of the Cascades, every Spokane listing carries Magic, and the Spokane Valley shops, all on East Sprague Avenue, include the area's sports-card stores. Yakima and Kennewick cover the middle of the state. In the far southwest, Vancouver is a bridge away from Portland.
Card shows, conventions, and tournaments happening across Washington.