Walmart offers the Contigo 16-oz. Autoseal Vacuum Insulated Stainless Steel Travel Mug with Handle in Black for $7.04. Opt for in-store pickup to avoid the $5.99 shipping charge. That's the best price we could find by a buck, although most sellers charge around $13 or more. Keeps drinks hot up to 5 hours or cold up to 15 hours.

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