How much does a new spoke cost? 75 cents? and another 30 cents for a new nipple?
take the old spoke out, go to a motorcycle dealer and tell them you need a new one, install the new one and retention it after riding it for a few miles, also check that your other spokes have proper tention or they will brake too, spokes brake when they are loose, not to tight! so make sure that all of them have tention of them, and if your wheel is out of true, either learn how to fix it, or pay someone else to fix it if you want it to be around very much longer and be safe to ride on.