I'm not sure I agree with cheaper on AM. :)
Plenty of DX on 160 AM in the winter but usually only during nets.
Most of the AM on 75 in the evening are usually low carrier with peaks of 100-130, some are 30-40 peaks. Round tables are generally Ind, where I am, Mich, IL, Mo, Tenn, Ala, Ga, Tx...