It depends on the company and the camera you want. It could get as high as $350/day! Where are you located? I know of some rental places, but they’re here in Chicago.
It could be worth it if you want to get great image quality without buying a camera outright.
Some cameras to consider: DSLRs are great, low cost, good quality but you’d want to make sure to get some good lenses to make sure it looks great. The RED has it’s own, great look but is quite expensive. Canon C100 could be a great option as well.
I’d love to help more but would need more info!