For a limited time Amazon has the Thermos Vacuum Insulated Stainless Steel Hydration Bottle (18 ounces) for only $13.99 + Free Shipping with Prime Membership. They're currently out of stock, but you can still lock in the low price on a super-highly rated stainless steel bottle.

The bottle features a flip-top with clasp, a double wall vacuum insulated container that locks in temperature (hot or cold), and a condensation-free design. Nearly 1,000 customers have given Thermos a 4.5/5 stars.