I'm not sure on the cost, but I think it's safe to say substantially more than in the US, for example.
There is no problem at all bringing in one. With more than one, I can't speak from personal experience, but it's probably safe to say that you would have some "splainin" to do. If you have a few you need to bring in, the best way would be to get some other travelers to "mule" them for you, one per person. As long as they are not in the box, they won't be questioned.