You might want to look around on Craig's list for an atv or lawn tractor plow. Then just build the frame to mount it. I did that with my cub cadet. The curved plow blade helps to roll the snow. Based on Vermont Craig's list for $100 or less you find something.
I made a blade for my old lawn tractor out of a old hot water heater, shell, jsut cut to lenght and cut the section I wanted it was pre curved, and welded on a wear edge,