For a J/30 in Chicago:
$70-$106 / foot depending on the harbor
$50 additional for water and meter reading
$115 (optional) for dock box
Electricity is extra, but it's usually just a couple dollars for me since all I run is a battery charger.
And then on top of all this:
7% Just-because-we-can tax
25% Surcharge if not a Chicago resident
