Best and inexpensive marinas on Kentucky Lake

I was wondering if anyone in this group might be familair with
the marinas on both Kentucky and Barkley Lakes. My father (retired)
is navigating his houseboat down there from the Upper Mississippi and
needs to find a reasonably inexpensive marina in the northern portions
of these two lakes. He is retired and has a limited income, so the
fancy marinas are simply out of the question. Any help would be
appreciated.

Thanks