In our area most of the guys grade them 1,2 or 3 , one being new 1 trip containers , 2 being a few trips but clean and 3 being construction site quality , prices range from $1200 to $3500 (20') $1400 to $3500 (40") some include delivery others add a few hundred to get a towing company to deliver.
We get big hot cold swings and there can be a problem with condensation, I have seen where they spray foam the ceiling to combat this.