Welcome, Advanced! Good to see you hear. Hope you'll stay and participate more.
There are tons of companies around here who do it for $35 or $40 per lawn - front and back. (Understand, I live in an area of mostly postage stamp lawns - 4000 sq. ft. total usually). I personally won't aerate a lawn for less than $75 or $80. And even then, a lot of times we're too busy with installs or clean-ups to mess with aerating. So I will usually sub it out to a friend of mine who owns one of those $35 per yard outfits. He charges me $35. I charge $75. I make $40 for doing next to nothing. Multiply that by the 40 yards we usually aerate each spring and fall, and that's a hefty profit.