How to Use Coupons: understanding how they work - The Coupon Project In most scenarios, you are able to use one manufacturer's coupon per item purchased. This means that if you have four coupons that read "save $1 on 1 cheese" you should be able to buy four cheeses and use all four coupons. However, I'm noticing more coupons that now have fine print that states things such as "limit 4 like coupons in a ...