The only local place that I know of is Overland Drive Shaft in Montville off of RT163. They are right next to Carvels Truck shop. I think they charge $70 to have a drive shaft balanced, but don't quote me on that. If you need directions let me know, I drive right past it every day on the way to work (at least I did before moving to NH, but I still drive past them on the weekends).
Overland is known for doing excellent work, but you pay for the quality.
