vending machine income
(8) “vending machine income” means receipts (other than those of a blind licensee) from vending machine operations on Federal property, after cost of goods sold (including reasonable service and maintenance costs), where the machines are operated, serviced, or maintained by, or with the approval of, a department, agency, or instrumentality of the United States, or commissions paid (other than to a blind licensee) by a commercial vending concern which operates, services, and maintains vending machines on Federal property for, or with the approval of, a department, agency, or instrumentality of the United States.