He must have told u the price including labor. If not then definitely u r at loss.
Try the granada strings. they cost around 100/-.
Why do u want to get it fixed from him? IT AINT DIFFICULT. ATLEAST TRY AND ITS OK TO BREAK A FEW STRINGS BEFORE GETTIN HELP.
GET UR GUITAR BACK FROM HIM.
Guitars : USA Fender Stratocaster 1981 Collectors Series, Ibanez RG420eg, Cort X6vpr Snake skin, Custom Tele Style Guitar
Processor : Boss ME 70
Amps: Laney Cub10(4 Sale), Roland Microcube
Recording : Focusrite Scarlett 2i2, Shure SM57
For Sale: Sansamp Tri-AC