All three of HBS' Shadowrun games available on Humble Store for $10. If you don't have this would be a good time to pick 'em up.
iOS or Android versions?
Not that I see... it's Thea for 50% off!ME:4 50% off for 32 hours at gmg.
Where? Gog? Steam?
Starpoint Gemini 2 is free until May 24th 10am PT. Once you add the game it will remain in your Steam account.