It depends on how your postal system works, I guess (unless you use a courier). For me to send such a package from here to Austria it would cost in the region of £25/32€ without tracking/signature, and near £30/38€ with. Extra insurance would probably be required too, which might take it to 40€. That's just Royal Mail's prices though, yours are probably different. Courier might be cheaper.
I don't think so. When sending items within Europe, you don't usually need a customs label attached. Also, I've sent several packages to Portugal worth over £300 each and the recipient never paid import duty on them. I've also received several valuable packages from Sweden and never paid import duty.- how about paying duty for that PS3 (do we have to within European Union?)?