REI Garage continues to offer the Hydro Flask 64-oz. Wide-Mouth Insulated Stainless Steel Bottle for $29.73. Opt for in-store pickup to dodge the $5.99 shipping charge. That's tied with our mention from two weeks ago as the lowest price we've seen. (It's also the best deal today by $11 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.