I'm not selling one, but if you are new to the game and haven't finished mentoring yet; if you graduate on Arkadia you will get the set for free. There are often people selling the set or parts of the set, on both Arkadia and Calypso, so finding one shouldn't be that hard. GL
Occasionally you will find a set for these available in Celeste Quarry. Again if you complete mentering you not only get the armour but also a 4 X 4 vehicle.