When I quote a roll cage for a customer there are a bunch of questions I ask before I can give them an accurate price.
First. How much interior is in it when it'll be brought to me. Removing seats, doors, dash, center console, paneling, seat belts, factory cage etc take time. I'm not gonna pull all those parts out of it for free and put them back.
Second. 2 seater cage or 4 seater cage?
Third. Do you want it tied into the frame or to the floor. Then do you want it bolted to the floor or welded? If you're going to the frame do you want it poly isolated or hard mounted?
Fourth. Seats mounted to the cage?
Fifth. What do you use the vehicle for? Crawling, bouncing, street driving, 50/50? Simply a harness bar or a full X in the B-pillar.
Changing any or all of these things can make a cage go from 1k to well over 2k plus you have to factor in paint or no paint. It can take easily 8 hours to pull a cage out of a vehicle, wire brush, scotchbrite it, prime then paint and reinstall.
I've learned over the years that if I don't ask all of these questions I don't make any money.