i had the same problem, left rear was leaking real bad...i wouldnt bother with resealing, i dont even know if anyone can do it...
the chaepest option for you is get a new set for the rear(its best to get them in pairs), installed it will cost you around $350-$400. These are after market ones, most likely pedders comfort or something like that..I can recommend a very good place in rowville that can do this for you, let me know if interested.
by the way i couldnt help myself and got a set of adjustable TEINs...must say kinda hard but shite load better than standards.