Look for the door in the Masonite catalog. Or find a local door/millwork supply and find out the brand they carry. Hollowcore styles are very common and can be ordered. The more common ones were well under $100. They can hinge match the mortises from the old door and you just take it home and pop in the hinge pins. If your door is as beat as it sounds, I'd drop a c-note rather than fixing it.