Zumiez May Same-Store Sales Up 3.6 percent June 4, 2014 SGB Update Zumiez Inc.'s same-store sales rose 3.6 percent in May. Total net sales for the four-week period ended May 31, 2014 increased 13.3 percent to $49.5 million from $43.6 million for the four-week period ended June 1, 2013.