Dan has just announced that Terraforming devices are going to be less frequently found in artifact shipments but will be dropped by certain NPCs
Quote:
I've had good luck getting terraforming devices from destroying the NPC Dark Scrap Carriers
The alternative to waiting would be to spend 36 Galaxy Points on each device. So 400 points would cover it as you can by 200 points for $20.
I have probably angered half the players who regularly rant against CC players so I would wait it out and get the devices "naturally" through the game. It might then give you the chance to keep the planet you can make with the mission reward.