CamScan is a manufacturer of printers, scanners, and other office equipment. It announces a cash refund for corporate purchases in large quantities. Rick purchases 20 color printers for his office from CamScan during this sale. To collect the cash refund, he needs to fill out and mail a form provided by CamScan, along with proof of purchase. In this case, which type of sales promotions is CamScan offering?

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