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Amazon [amazon.com] has 21-Oz Hydro Flask Stainless Steel Standard Mouth Water Bottle w/ Flex Cap (Stone) for $ 15.92. Shipping is free w/ Prime or on $ 25+ or $ 35+ orders (minimum requirement varies by location).
21-Oz Hydro Flask Stainless Steel Standard Mouth Water Bottle w Flex Cap (Stone) $15.92 + Free Shipping w/ Prime or on orders $35+