I don't do aerations or won't do them unless I had a stand on unit like the Exmark. The fert and squirt businesses control the aeration market around me.
My yard is ~40 to cut and get estimates 75-120. I wait around until someone rings my doorbell on a Saturday and leaves a flyer saying "We are doing aeartins in your neighborhood today. Your cost is X" I call them up and offer 50% of what they are asking and they take me on the offer.