Depends on how much your local yard pays for iron, how much you clean it, and how much it weighs. If it weighs 500lbs and you clean it all you'll probably get about 5lbs of boards, 5lbs of insulated computer wire, a pound or so of hard drive if its surveillance has both local and remote backup, a pound or two of power cable, max 5lbs of motors and the rest as tin or hms prep depending on how you clean it. The price will depend on what you get locally for these. Base your offer off that. Also keep in mind you may need help to move it. Free standing atms weigh between 500-1100 lbs. That could require additionally costs for labor on your end for help.