I bought my front wings new from Toyota and they were a little over £100 each, and the same again for painting (they'll need to be blended back into the doors), they fitted like a glove though obviously and they just bolt on. If you looking to blend the rear fenders in then the price will go up by alot, but i agree with Rob, if you did it, you'd need to spray both rear quarters, the roof, both doors as you'll need to blend it in front and back for the fenders and wings and also blend it into the rear bumper i would imagine. I paid £800 to have some work done recently (040 white), judging by the difference in work i'd say yours would come to around £1000-12000, not including the price of the wings.