I imagine most of the stuff TVS made (which wasn't inherited by Meridian) is. Disney simply are not interested in it - I suppose maybe they don't want to be associated with it? In which case you'd have thought they'd sell it en masse for a peppercorn?
There might be hope yet. Disney obtained the TVS archive by buying Fox Family in 2001. At the same time, they also acquired Power Rangers, as Fox Family owned Saban Entertainment, it's production company. Last year, the Power Rangers franchise got sold back to Haim Saban and his new Saban Brands holding company (the show is due on Nickelodeon/Nicktoons soon, according to Sky magazine). So who knows, maybe Disney will realise that PR wasn't the only decent thing they got from buying Fox Family, and will start selling off some of the TVS content too.