The Cube, by Suorin, is a very well built rectangular disposable available in the same flavors offered by Suorin Air, Suorin Air Bar Lux, Suorin Air Bar Max, and Suorin Air Box.  This variant features a 5.5ml juice reservoir and a 1100mah battery.  Each Suorin Cube is simply labeled "Cube", but has an anti-counterfeit label on each box which comes from the same factory as Suorin.  The nice thing about the reinforced metal design is that it doesn't roll away like cylindrical disposables.  Here is a full Suorin Cube Flavor List:
Banana Ice
Blueberry Blackcurrant
Blueberry Ice
Cherry Lemon Shake
Cool Mint
Cranberry Grape
Energy Drinks
Kiwi Lemon Shake
Strawberry Kiwi
Strawberry Mango
Strawberry Watermelon
Watermelon Ice