Regardless of the cause of broken spokes, unless you learn to
replace and properly adjust them yourself, your money and time will
continue to be depleted by trips to bike shops. I always carry several
spare spokes taped to the frame and immediately replace broken ones with
the tools from my emergency repair kit. Riding on a wheel with a broken
spoke will stress the remaining spokes next to it and may lead to them
also breaking before long. It's also damaging to the rims and hubs to
run on an out-of-true wheel and will wear out a tire much faster.

Steve McDonald