The Balloon Mk.II is a boost rated solid 10 on the Thrust Evaluation bar. It is a One Shot boost.
The Balloon Mk.II requires the Omega Catalog to be purchased in the Bonus Shop first. Then it is available in the Shop for $25000.
"Creators of the Air Balloon knew their design was ahead of their time. Using ALIEN technology they were able to reach their initial view of this propulsion system."