I bought four of these in December at an average price of $36.00 ea. Currently, the blue mug is selling at its lowest price ever on Amazon, $25.45.
If you run hot water through the mug prior to filling it with hot coffee/tea/etc., you can expect your drink to stay piping hot for 8+ hours. On the opposite end, adding ice cubes will give keep your drink cool for days. I recently packed a mug of iced water for a hike in San Diego, and noticed 3 days later that the ice cubes had not yet melted.
Smoky Blue: $25.45
Lavender Pink: $27.95
Champagne Gold: $28.07
Product Description: Zojirushi's stainless steel vacuum insulation mug will keep your beverages hot or cold for hours. The compact design takes minimal space while maximizing capacity. Each flip lid is tightly fitted for excellent heat retention, and features a safety lock to prevent accidental opening. Durable and sanitary these mugs have an 18/8 stainless steel interior with SlickSteel™ finish. SlickSteel™ is created utilizing electropolishing technology, these products are non-coated on the inside and instead use an electrically charged polishing process to treat and finish the interior. The results is a corrosion resistant surface that repels foreign substances and stains, creating a smooth and ultra clean stainless steel environment for your drinks.