Why do we feel so satisfied when we score a great deal? Behavioral economists say it's because of the "pain of paying" — the psychological discomfort of spending money. Coupon apps help soften that ...

Stack everything: At Safeway, the best deals come from layering sale prices, digital “Just for U” coupons, and rewards points — don’t rely on just one. Start in the app: Clip coupons before every trip ...