Target is now selling the LEGO 2015 Minifigure Cube for $10. This is a Target exclusive and contains 4 minifigures from different themes.
Lightning Lad (DC Super Heroes)
Blue Diver (City)
Sir Fangar (Legends of Chima)
Lightning Lad is exclusive to this set while Kai and Sir Fangar are unique variants.
The set is available online and in-store. The set is also free if you manage to spend $50 on LEGO City, Ninjago or Superheroes sets.