unless your camera is still in Warranty, Canon USA, in Irvine CA charges a minimum of $219.00, they call it Out Of Warranty labor charge, plus shipping, about $15.00.
That charge though includes checking out the camera's functionality, cleaning and resetting to factory specs. If any additional parts are required for repairs, these will be added after you have OK'd them.
My 1DS MKII required a new shutter assembly, failed after about 212000 actuations, total cost to me was around $500, still cheaper than a replacement body!