Proozy offers the LifeStraw Personal Water Filter for $13. With free shipping, that's a buck below our April mention and within a buck of the lowest price we've seen for this filter. (It's the best deal now by $6.) This award-winning, BPA-free device enables you to safely drink contaminated water. It removes almost 100% of waterborne bacteria and protozoan parasites and will filter up to 1,000 liters of water. Deal ends June 13.