I'm in high school and I'm learning about aeration and the best equipment to use. Most yards in my city are a quarter acre or less. I don't need a $1000+ walk-behind aerator to do yards, at least not this early. I have enough energy for a quarter acre, but I don't know any manual aerators that would be a $500 or less investment. Sorry for sounding like a rookie, but I don't know where a could find a manual aerator that can still do a quality job- I don't care if it will take longer or more work for now.