ORANGE — The town administrator said last week that Orange will come up $336,000 short on its health insurance appropriation amid rising costs, and the Selectboard encouraged him to explore other avenues for providing town employees with health care. “Health insurance costs have been spiking,” he said at Wednesday’s Selectboard meeting. “There’s no way to quickly switch health insurance to save this $336,000,” he said. Selectboard members agreed it would likely be worthwhile to explore joining the Group Insurance Commission. Member Mike Bates, a veterinary technician at the University of Massachusetts Amherst, also raved about the coverage he gets through the Group Insurance Commission.