Amazon offers the Culligan Faucet Mount Filter, model no. FM-25, for $18.69. (Home Depot also offers it for the same price with in-store pickup.) Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $6.90.) That's the lowest total price we could find by $20. It features a polished chrome finish and puports to reduce bad tastes, odors and other water contaminants.