yeah u can buy those episodes,
u can also get trunks past alternet future episodes u know where supposely all the z fighter yes vegeta died apart from trunks and gohan who dies as well later. i watched some of that video on the internet any it showed when trunks went super sayin-jin for the first time it was in japanese but it had english subtitles at the bottom. it was quite funny, trunks starts building up energy but he still cant go ssj then someone shouts out "get angrer" and trunks does and he goes ssj for a couple or secs then faints, cool huh