Hi. My name is*****'m a camera repair technician with over 20years in the business and I'll be glad to help you with your question today.
The camera is repairable but it will require a new mirror cage / front standard. This is a $200 part and should be replaced at an authorized Nikon repair facility. There are a few located throughout the country but the 2 main facilities are located on either coast. Below is a link to Nikons support site to get you started. If I can be of further help, please ask.
The repair may not be cheap but it will definitely be less than a new camera.
Just a note to see if I can be of any further assistance?