Plasma Burst Generator Forge
There are Plasma Burst Generator Forges in the Unknown Sector east of PTNI Headquarters, in LooManckStrat's Legacy, in Danna's Chance and in Maelstrom. However, they are hostile towards all players at the start, which means that they don't sell their Plasma Burst Generators to the player. A Station Hack will solve this problem.
Can be purchased from the Yaki Shipyard in Senator's Badlands as a reward for completing Shady Business.