I'm late to the show as usual. These cubes were available as a doorbuster for Black Friday at Target. They retailed for $9.99 or were free with a qualified $50 purchase of Legos, which wouldn't be hard to hit at Target. There were two cubes available each with 4 minifigures each. Each cube had a Ninjago, Legends of Chima, DC Superheroes and a City themed Minifigures with gray stands.
Ninjago Lloyd in Dragon Outfit
Chima Lavertus in Fire Outfit
City Swamp Police Sheriff
DC Comics Superboy
In the other box you got:
DC Comics Lightening Lad
Kai
Sir Fangar
Scuba Diver
Not a bad deal as a buy alone or as a bonus. These are selling for double to triple the original price now. The only two minifigures I'd care for are the DC Superheroes so probably won't be too hard to track down.