Don't give up so easily!
Try Craigslist: Lake of the Ozarks, include nearby areas too. A lot of decent deals for freshwater boats.
https://loz.craigslist.org/d/boats/search/boo
There are new 2018 and 2019 boats advertised now at less than invoice because they have been sitting at the dealers too long and newer models are available. The manufacturers are getting involved in the discounts so their dealers will take delivery of the new models.
Go on Boatrader, Boats.com, Iboat and the rest. Do a search within 500 miles of Chicago (60606). Plenty of freshwater boats, and remember, the farther north you search the less the boats probably got used because the boating season get shorter.
I would never buy a used saltwater boat because there are plenty of great used freshwater boats. You just have to be patient and look. That is what New Hampshire winters are for (from what I remember)