Dick's Sporting Goods offers the LifeStraw Personal Water Filter for $12.50 with free shipping. That's tied with our mention from two weeks ago, a current best by $6, and the lowest price we've seen for a single unit. This award-winning, BPA-free device enables you to safely drink contaminated water. It purportedly removes almost 100% of waterborne bacteria and protozoan parasites and will filter up to 1,000 liters of water.