Go on craigslist a do a search. I see a lot of ads locally and there was even an ad for J B Hunt 53'ers.
Try to get "High Cube" and stay away from any fiberglass sided ones.
I bought my 45'er from a private company for $1500. but it cost me $450. for wrecker to deliver 60 miles.
I didn't think when I placed it and I had to drag out of the way and turn it to put up my 40' X 60' building.