S7-U44 can be found in a little Merchant Tent at /waypoint -4802 4135, which is directly North East of the Royal Hanger in Theed on Naboo. He also can be found in Coronet on Corellia just a short distance from the entrance to the Starport at /waypoint -152 -4809
This vendor droid sells all things related to the Chronicles System that was brought into the game with Game Update 13. Items can be purchased using silver coins that are given as rewards for completing Chronicle Quests or gold coins that are equivalent in value to 1000 silver coins. All of the rewards are Tradable.