DC Super Heroes and Marvel
#70903-1 - THE RIDDLER RIDDLE RACER - THE LEGO BATMAN MOVIE
Released on 2 January 2017 in the US, it has 254 pieces and at a retail price of $29.99 its $0.118 per piece.
#76057 -1: Spider-Man: Web Warriors Ultimate Bridge Battle
Released on 1 August 2016 in the US, it has 1092 pieces and at a retail price of $99.99 its $0.092 per piece.
#76044-1: Clash of the Heroes
Released on 2 January 2016 in the US for $12.99. It contains 92 pieces and 2 minifigures which works out to be $0.14 per piece.