Personal care products 

You should never buy personal care products like toothbrushes, toothpaste, cosmetics, and shampoo at full price. All of them are consumable products that tend to go really fast, so buying them using coupons should be a priority.

When it comes to cosmetics, RetailMeNot offers a plethora of coupons; some could get at 20 percent off. Getting toothpaste and toothbrushes using coupons could save you 75 cents off a new toothbrush and even $1 off a tube of toothpaste.

You can get a pretty good deal on your favorite shampoo, too. Brands like Infusiam, TRESemmé, Garnier, Pantene, and Suave offer coupons twice a month.