Question: I dropped my Nikon D3200. Camera still turns on, but the lens wont attach to the body. It looks like something at the bottom of the lens might be broken; not the actual lens, but a small black circle type of thing. Anybody has any idea how much something like that will cost to repair?

Answer: 
Your best bet is to contact a Nikon service center about it and ask them for an estimate. It's hard to tell what might actually be wrong without a more detailed explanation and possibly photos. Even the Nikon service center might not be able to estimate it without actually having the camera in hand. There is normally a ring that doesn't go all the way around the lens on Nikon lenses, so what you think is the problem might not even be the problem.
First ensure that your camera works. Shoot a few pictures without the lens and confirm that you get pictures. Better idea would be to borrow a lens from a friend or go to a local retailer. If you figure that your lens is broken but your camera is okay, you can [buy a new lens for 200 or less](http://www.bhphotovideo.com/c/search?atclk=Lens%20Mount_Nikon&ci=274&N=4288584247%204261208195%204108103566). This means your max budget for repairs should not exceed 200. Then follow @AJ Henderson's answer and decide which way you want to go based on the cost.