Coming from Previews (comic distributor), is a licensed retro lunchbox and thermos, to be released in November.

Since it is a Preview exclusive, you might need to go through a comic store to order one, but it is us$25, which would probably be $45-50 at a comic shop here.
But be quick to enquire at a comic store if you really want one, as pre-orders close in 4 days time.

From Surreal Entertainment. A PREVIEWS Exclusive! Keep your lunch protected throughout your epic quest with this Dungeons & Dragons themed illustrated Tin Titans Lunchbox! Featuring artwork from the classic 1980's animated series, the front features a group illustration of the main characters while the sides sport some fearsome foes! This stylish lunchbox also includes a Dungeon Master 10oz retro-styled beverage container/soup cup. Don't miss out on adding this lunchbox to your Dungeons & Dragons collection today! Lunchbox measures 7.75'" x 6.75" x 4". Hand wash only.