For that many acres, you would be better to buy an old one if you can't rent one. RD rancher is right on the time being close to bush hogging but fuel usage and the chance of damaging the machine would be way less so adjust your price accordingly.
They also make tow behind ones that have a hand operated hydraulic pump to raise and lower them, depending on your property type if you don't have a tractor you could tow it with a truck.
The aerator type are pricy, the one I had was the slicer style and I wasn't impressed with it. 4" wide and tuff looking but everything worked, bought for $500. Sold it for more.