From where can one purchase vehicles for snowplowing?

For general purpose plowing a multi-purpose pickup truck is probably what you are looking for. These can be purchased at most car dealerships. Ensure that any purchase you make contains 4-wheel drive where you can lock your differential to provide the best traction while plowing. For larger purposes plowing you may need to visit a more specialized truck dealership looking for something like a small dump truck or some sort of front loader. But this depends on the type of plowing being done.