Jetery-US via Amazon offers the Jetery Faucet Water Filter in White for $22.99. Coupon code "7EQFZ93V" cuts the price to $17.93. With free shipping for Prime members, that's $5 off and the lowest price we could find. This BPA-free filter can deliver 320 gallons of fresh water every six months and features a 3-stage switch. Deal ends August 12.