Costco in-store sales can be defined in many ways. In-store sales may also be defined as in-line sales, national sales, warehouse sales, full roll out sales, or simply as Costco sales. In-store sales are the most common and the most sought after category of Costco sales; likely because they are typically the most profitable. When visiting your local Costco warehouse, most of the palletized items that you see on the sales floor are considered in-store sales (with the exception of Road Show and Test items).