Which part broke? If it was just the scales or a liner then your still in pretty good shape. You can make a new liner pretty easily as long as you've got a hacksaw, drill press ( a drill press works best you could use a hand drill if you had too) and either a belt sander or just a file and some sandpaper. You can buy brass sheet stock from any of the knife supply houses for fairly cheap.I think lowes even carries along with copper for flashing and welding grade steel, its with the fasteners I think.
As long as the blade, locking bar and backspring are still in tact you can make a new handle, it would be even easier if you could re use the back spacer and bolsters. Then its just a matter of cutting stuff out, drilling some holes ( you can use the original liners and the other parts to lay them out) and pinning it all back together.