how to by a borg cube

To get a Borg cube without playing as the Borgs you have to build Romulan star base on planet Hof''Maso when it is done building go to the station and you will see that you can by a Borg cube Note: the borg cubes you by for your fleet are bigger then Borg cube you get to be. also you can purchase the dyson sphere there two for cheaper