Groupon is currently running a deal on the Lifestraw Personal Water Filter. You can normally find these at Safecastle or Amazon for about $20 or so, but right now Groupon is selling them at $16. It looks like the deal is going to run for about 7 days more, so if you have been waiting to pick up one (or more) of these, it might be a good time to do so.
Groupon deal: Lifestraw Personal Water Filter
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