Woot has Lifestraws for $9.99 today. limit 3. I picked up a couple last time they had this deal.
https://sport.woot.com/offers/perso...il&utm_term=0_c5ca76da11-94438276e4-280639554
https://sport.woot.com/offers/perso...il&utm_term=0_c5ca76da11-94438276e4-280639554