Pike Place Market has at least one quilt shop, my sister went there, or is going there this weekend. There's a cute quilt shop in Kingston, just off the Edmonds-Kingston ferry. There's a newer shop in Marysville, but it has some odd hours and is NOT open on Saturday's.
This is all about an hour north of Seattle, so I'm not sure you want to take that drive.
This might help....maybe:
http://www.wrbqinc.com/wa.php