REI Garage offers the CamelBak Podium Big Chill 21-oz. Insulated Water Bottle in Eucalyptus or Sprint Green for $5.73. Coupon code "XTRA25" drops it to $4.30. Opt for in-store pickup to dodge to the $5.99 shipping charge. That's tied with last month's mention and the lowest price we could find by $6 in any color. It features BPA-free plastic. Deal ends December 24.