after a quick scan around, good ole htfr seem to have the best price for the hd25sp -
http://www.htfr.com/more-info/?catno=MR22949
if i were u, i'd get a spare lead just as a stand-by, and i'd run a few loops of masking tape tightly around that connector on your existing lead, it'll probably be fine like that for a long time yet... provided that the internal red n blue leads are still intact and the sound ain't breaking up.