Cost effective 14,000 tow rating

From what I hear it is hard to come by a truck with that tow rating due to soaring home building, Covid shut downs, parts shortages, etc. The newer gassers can definitely do the job and would cost less but they were never popular new and scarce used. Since you mention cost effective and don't seem to have any reason to be in a rush I suggest that keep an eye on Craigs List, Facebook and other sell it yourself places and be prepared to wait 6 months or more for something you like to pop up. Be prepared to act when something does pop up, it may not be there long. Especially if it is particularly "cost effective".