Can you post a pic? If it's crushed, you may need to replace it. If it's just a large dent there are plenty of good body shops that will repair it, and give you a lifetime warranty on what they do. A used liftgate will run probably $1500 min IF you can even find one. In Arkansas, $1500 will cover ALOT of labor if you decide it's repairable. Body shops will all tell you to replace it because they make more $. However if it is repairable, and you go to a quality shop, you might save some money. Again, that's all pending that it is in fact repairable and not completely crushed.