Zumiez Posts 9.7% July Comps Increase August 8, 2007 SGB Executive by Teresa Hartford Zumiez Inc. recorded a July sales jump of 42.4% to $28.2 million from $19.8 million for the same month last year. The company's comparable store sales increased 9.7% for the four-week period, on top of an 8.4% improvement in the year-ago period.