school store; co-op; purchasing department
Refers to a shop or purchasing section within a school, company, or organization. In a school context, it is the student store selling supplies and snacks. In a business context, it can mean the procurement department.
I bought bread at the school store during lunch break.
I placed an order for stationery with the purchasing department.
Compound of 購買 (こうばい, 'purchasing') and 部 (ぶ, 'department' or 'club').