Ends 3/28. Sport.woot! has the LifeSaver Wayfarer 5000L Manual Water Purifier (LEP6000) on sale for $71. Free shipping with Amazon Prime, otherwise $6. Pocket-sized and great for hiking or camping. Can purify up to 1,320 gallons (5,000 L) and removes 99.99% of all microbiological foreign matter. 

• The LifeSaver Jerrycan Water Purifier is also on sale for $198.