You can see the latest weekly ad for this week from Costco here: Costco Weekly Ad (August 1 - 21, 2016).
Costco Wholesale Corporation is an American membership-only warehouse club that provides a wide selection of merchandise. It is currently the largest membership-only warehouse club in the United States. As of 2014, Costco was the third largest retailer in the United States. By 2015 it was the second largest in the world (after Walmart).
Costco's worldwide headquarters are in Issaquah, Washington, USA. The company opened its first warehouse in 1983 in Seattle. Through mergers, Costco's overall corporate history dates back to 1976, when its former competitor Price Club was founded in San Diego, California.