find a legal dump and price borrowing or renting a dump truck.

it might be a little cheaper.

disposal costs so much today because the stuff is basically put in a
tomb, rubber liners, clay layers rubber top lots of government
inspections.

having done some demo its going to be a big long dirty miserable job.

get some quotes from demo companies it might be cheaper they come in
with a backhoe and its gone in a hour loaded in dump trucks.

pro companies get better dump rate since they do it often.