Gaming mice are not cheap,sell for $30 - 130. The cord on my RAZER DIAMONDBACK mouse went bad, I opened the mouse & repaired the broken wires.You have to unplug cord from inside mouse,the connection plug has very small barbs,so you have to pry the socket open a bit to unplug it.Once the cord is out cut the rubber part on the cord that connects to mouse that reinforces the cord.Cut it off on both side,pull out the remaining bits of wire.You have to enlarge the hole in the rubber grommet to reinsert the cord threw it,a heated wire the size of the cord works well to enlarge the hole.Run cord thew grommet splice wires,solder wires if you have a soldering iron makes the best repair,splice wires offset from each other,so they are not all sliced at same location.Use a good tape to isulate the spliced area on each wire,about 1/2 of tape per splice,Scotch Super 33+ Premium Vinyl Electrical Tape. Once you have taped each wire, tape all the wires together, for better isulation.Reinslall wire harness & test mouse.

You can ask an expert to find where the breakage in the wires is and join and insulate, or get mouse wire as substitute for that one or obviously get a new one - they are fairly cheap.