Its not too expensive, maybe between 100,000 - 200,000 IDR. Part is made up of soft flexible rubber.
I noticed that were was air leak points between the duct and the bonnet, so I glued some foam padding on the duct. Its a little better now, but not perfect, I may have to find better solution.
Unfortunately, in India, Honda does not sell parts off the counter, you have to give them the vehicle for servicing and they install it themselves.