Bro, if it is just the fender, then probably no need to change, cos it's metal, and can be panel beated back into shape. That plus spraying, should probably cost about $350 if no other parts r damaged.
Even if you change a new piece, you will still need to paint because the parts usually come in a different colour to your car. Also, to keep the costs low, you might decide to go for a 2nd hand part.
To be sure, it's better that you visit a workshop to let them assess the damage, cos it's very hard to quote over the web..
