Amazon offers its Prime members the Brita On-Tap Faucet Water Filter System
in Chrome, model no. 10060258356189, for $19.99
with free shipping
. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.87.) That's the lowest total price we could find by $5. This BPA-free system can filter up to 100 gallons of water.