If you can find someone with an old cable tool (or hammer) drill rig. They are slow and cost a little more per foot but they dont always have to go as deep. A rotary rig uses a type of drilling mud that can seal up smaller veins of water, so the driller misses it and keeps going deeper and anytime you go deeper everything costs more, pump, wire, well, etc..... A cable rig just uses water to drill so even if theres a small amount of water in the well the driller will notice it. The only downside is some areas a cable rig cant drill because of limestone, granite etc so then your stuck with a rotary rig.