I need some ways to make quick cash,i want to fully repay him in about 2-3 weeks
(and it doesn't have a warranty)
Besides selling your own stuff, there is no way you can make that much in that short a time. Assuming you walked out and found a job tomorrow, at 40 hours a week, you would have to get paid $30 and hour and my guess is that you do not have the knowledge or experience to get a job paying $30 an hour.
Repair should cost considerably less, like a couple hundred max. Probably just a blades and body damage issue, look up the cost of parts for that exact model number. Crashes are commonplace, they don't total out, like a major car crash.
Here's an example "Crash Pack" for a cheap quad copter.
Sell weed
Sell/pawn your stuff.