REI Garage offers the Hydro Flask 64-oz. Wide-Mouth Insulated Stainless Steel Bottle in Stainless or Black for $29.73. Opt for in-store pickup to dodge the $5.99 shipping charge. That's tied with last week's mention, the lowest price we could find today by $35, and a great deal for an insulated stainless steel bottle of this size. It features double-wall vacuum insulation that keeps liquids cold for up to 24 hours and hot for up to 12 hours.