I have access to proper workshop equipment, so I can re-saw stuff - but my experience of buying is all for making fine joinery and cabinets.
I was imagining something agricultural/traditional.
Know a anyone with an old shed/barn they're getting rid of?
I used boards from such almost 30 years ago when I wanted to clad a new shed in a way to make it look older.
Cheap, cheap??? This is likely impossible at the moment.