I also baulked at the £60 cost of a new cable when mine broke. I searched the forum and found an excellent post from Roger telling me to repair the old one.
Duly got a bike inner brake cable, dismantled the old one then soldered in the new inner cable after drilling out the old solder. Be very careful not to lose the tiny woodruff key (I lost mine but made a serviceable replacement out of a ground down washer). File the brass teeth will it is in bits to stop it slipping. Put it all back together and back in and it all works.