Tanga offers the Alexapure Pro Water Filtration System for $99.99 with free shipping. That's tied with our mention from two weeks ago as the lowest price we've seen. (It's also the best deal now by $49.) It purports to transform water from almost any fresh source into clean, healthy drinking water. It removes up to 99.9999% of impurities, holds 2.25 gallons, and has a filter capacity of up to 5,000 gallons.