The product overview at the Gigabitfilm website is a sheer mess, showing different product listings depending which language you chose and so forth. There is no chance to see which products are currently offered and which are just cited as historic reminiscence.
I strongly advise you to contact Detlef Ludwig (see `Imprint´ at the site) for availibility.
Gigabit film is Copex film. Not only is it a difficult film to use, it can not be used as a cine film because it is a poly based film. Poly based films do not run well or at all in most cine machines.