Mando's reward for delivering Baby Yoda to the client is a large amount of Beskar steel, a rare and valuable metal used by the Mandalorians to make their armor. This reward is significant to Mando as it not only enhances his own armor, but it also provides him with a sense of belonging to his people and culture. However, Mando later realizes the true value of Baby Yoda and decides to protect him instead of delivering him to the client, resulting in a conflict with other bounty hunters and the criminal underworld.