I dunno whether you'd be able to get the cut scenes on their own (if thats what you mean). You'd have to download the Special Edition I think. The Special Edition has one or two scenes that should really have been in the film, but it also has some really crap flashbacks that irritated me when I watched the SE...but the scene that looks into a certain character's past (quite important if you haven't read the book...which is even better than the film) is quite uncomfortable but it adds a bit more depth to the film.

BR2 is good but don't expect more of the same as the first film...it is very different (a lot of people hate it...but meh, can't please em all).

Anyway you can find them both on http://www.suprnova.org by clicking search and searching for 'battle royale'. I'll link the torrents directly below anyway...

Battle Royale 2

Battle Royale - Directors Cut/Special Edition