Where's a good selection of kosher wines in Seattle?
Best 2 places are QFC in University Village and Albertson's on Mercer Island. They also have the largest Kosher selections in general (food, butcher, etc...), and especially have large Passover sections.
Other locations around town usually have a bottle or two, and any wine store should be able to order most things for you. If you need it for your Seder, these are far and away your best choices on short notice.