Unfortunately you can?t buy Cable albums, t-shirts, singles etc any more. You often see them on Ebay (sometimes quite cheap and other times ridiculously expensive) but it does give you somewhere to look.
Also there is normally people selling Cable items here on the forum, just check out some of the other/older posts.
Lastly if its just a copy of the music you want I?m sure someone here would be happy to send you anything you don?t already have, we here at Sub-Lingual towers now have quite a decent collection of rare and live Cable music that we?ve sent to people before.
I wish you luck with your search
Damon!