OXA Home via Amazon offers its OXA 2.5-Liter Alkaline Water Filter Pitcher with Two Long-Life Smart Filter Cartridges for $36.99. Coupon code "QQ2W77BA" cuts it to $20.34. With free shipping, that's $4 under our July mention, $30 off, and the lowest price we could find. This BPA-free pitcher helps filter out chlorine, lead, copper, and other contaminants to produce water with a pH of 8.5 to 10.