Are Online Coupons Illegal?
While, generally speaking, most companies do not object to people sharing coupons with friends and family members, the act of collecting coupons for profit goes against coupon usage terms and it is illegal. The risk of ending up with counterfeit coupons increases when buying coupons online.
Using a coupon for a product other than the item that the coupon is for, even if it scans without beeping at the register, still is fraud.
Super Couponing: Glitching in any form is coupon fraud - Capital Gazette
Can you go to jail for using coupons?
Coupon fraud is a punishable offense and, while penalties vary case by case, the Coupon Information Corporation (aka, the CIC) says that the harshest convictions for this type of fraud include a 17-year prison sentence and a financial penalty of up to $5 million.
Being Aware of Coupon Fraud - Protecting Yourself