The Mets on Saturday signed Dominican prospect Francisco Pena, the son of former MLB catcher Tony Pena, a source told ESPNdeportes.com. The Mets, who paid Pena a bonus of $750,000, are not planning to make the move public until next week. Besides the bonus, Pena would receive schooling expenses in case he decides to take up his studies again, and he could be invited to the Mets' training camp next spring.