Authentic Kristaps Porzingis Memorabilia. Shop Our Selection of Kristaps Porzingis Signed Collectibles. As a Young Rising Star in the NBA, Porzingis was Named the Runner Up for the Rookie Of the Year Award in the 2015 -2016 Season. Memorabilia Autographed by Kristaps Porzingis is Sure to Increase in Value as He Continues to Play at an All Star Level. Bring Home a Piece of the Game With Porzingis Collectibles, Exclusively at Steiner Sports.