While some former Price Club locations in California and the northeastern United States are staffed by Teamsters, the majority of Costco locations are not unionized. The non-union locations have revisions to their Costco Employee
Agreement every three years concurrent with union contract ratifications in locations with collective bargaining agreements. Similar to a union contract, the Employee Agreement sets forth such things as benefits, compensations, wages, disciplinary procedures, paid holidays, bonuses, and seniority. As of March 2011, non-supervisory hourly wages ranged from $11.00 to $21.00 in the United States, $11.00 to $22.15 in Canada, and £6.28 to £10.00 in the United Kingdom. In the US, eighty-five percent of Costco's workers have health insurance, compared with less than fifty percent at Walmart and Target.
Product-demonstration (e.g., food samples) employees work for an outside company. In the western U.S., the company is called Warehouse Demo Services, Kirkland, Washington. Costco also uses Club Demonstration Services, based in San Diego, California. In Canada, demonstrations are done exclusively by Professional Warehouse Demonstrations.