Moti Levy in NSW (I realise the other side of the world for you) charges in the vicinity of $30 to $35 per metre (of damage). If you measure the length of the tear it will at least give you a rough figure of what you will be up for. (excluding postage obviously) He works at AR Wakensurf in Tweed Heads. Do a search on the net and you can get his mobile number and talk direct with him, or if you have a copy of KBM he advertisers in there. He will courier the kite back to you once repaired. I have a kite with him at the moment and whilst I haven't yet seen his work I am told that he is very good.
I should mention that pricing doesn't include if he has to remove bladders etc. which costs a little more. Just realised I sound like a commercial. If I keep this up I might have to start asking for some sort of commission.