Walmart offers the Brita 34-oz. Hard-Sided Water Bottle with Filter in Clear Lines, model no. 35921, for $13.21. (Amazon charges the same with free shipping for Prime members.) Opt for in-store pickup to avoid the $5.99 shipping charge. That's the lowest price we could find today by $2, although we saw it for slightly less in October. This BPA-free bottle filters up to 40 gallons of water and features a screw-on cap, easy-sip spout, and carrying loop.