This release is only available in retail Mega Boxes. It is a 50 card partial parallel of the update set with some inserts as well.
These are for trade:
MB6 Cespedes OAK HR Derby
MB11 Carlos Martinez STL RC
MB14 Votto CIN AS Game
MB17 Kevin Gausman BAL RC
MB35 Marcell Ozuna MIA RC
MB37 Jose Fernandez MIA AS Game
MB50 Liriano PIT
Postseason Heroics PH1 David Freese STL
These are for trade:
MB6 Cespedes OAK HR Derby
MB11 Carlos Martinez STL RC
MB14 Votto CIN AS Game
MB17 Kevin Gausman BAL RC
MB35 Marcell Ozuna MIA RC
MB37 Jose Fernandez MIA AS Game
MB50 Liriano PIT
Postseason Heroics PH1 David Freese STL