About $150 maybe for the Ohio brooder and break down brooder with chicken wire I already had. Those boards for the doors really added up fast and a cheaper way to build them would save money. I didn't realize how fast they added up until I was done.
I just built https://archeryrob.wordpress.com/2020/07/28/ohio-brooder-with-temperature-controls/ which the big part breaks down to be stored flat in the attic of the garage. I posted it in the articles section also, just can't remember how to find it now.