I was going to put in a steel door in the hall of my Daughter's office. Always looking for good but watching prices. The price for a steel door with a steel frame is close to a grand. Ouch. I get on FB marketplace and there are a few used ones for sale, but they are far away. I will have to frame the wall in and thinking if I should just try a solid door with a residential frame. Or just keep looking for a while. They have knock down door frames. Only place I seen so far has been Home Depot and they are $300 just for the frame.