installing a radiator

Anyone know the ballpark cost to have a new steam radiator installed? basically the existing one is big and positioned so as to take up space that could otherwise be occupied by a desk or bookshelf so i want to have a new one installed under the window adjacent to it. i do not think this would involve any plumbing changes other than having the pipe valve coming out of the floor elbow to the right rather than the left…….any insight is much appreciated.