On the low end of that price range you might get a 17,000 pound machine. While on the high end, you could rent a 76,000 pound machine. A 45,000 pound machine might run $2,000 to $2,500. Monthly rates start at about $3,000 and run as high as $15,000 or more. A mid-sized, 45,000 pound excavator would probably rent for $6,000 to $7,000 per month.