Sorry to hear about your run-in with Gravity, mr. Tofu.
In my experience, repairs USUALLY run about 50% of the camera value. In your case, soon as they find out it is an IMPACT problem, they will most likely NOT give you the lower end of the repair estimate. I sold cameras for years, and "impact" issues (specially a camera dropped over a 1/2 dozen feet!) is not something that excites repairmen... it excites salesmen.
That being said, you can always send it into the manufacturer and get a REAL quote. If it is too much, tell them to keep it - you are no worse off then if you chucked it into the dust bin right now. BUT, maybe, you'll get lucky and they's say they just happened to have some parts left over from another repair and they can fix yours up for 50 bucks. In any event, it is worth shit now, and for the cost of postage you can find out the actual repair price and then make an educated decision.
(my actual feelings are I would not really trust too far any camera that had the drop that yours did, no matter if it was "fully" repaired or not. But that's me.)
Good luck with your situation.
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