I'm selling a few unused 12" speakers and someone from Australia is interested in one that is otherwise hard to come by in that country - nothing rare or vintage, just a brand/model that isn't widely distributed there. Can any one offer a little advice on the best shipping carrier, approximate cost, liklihood of the speaker arriving undamaged (assuming it is packed well and double-boxed), etc? I am on the west coast of the US. I've shipped and received a number of speakers domestically, but I have never shipped anything as large as a speaker internationally. Thanks in advance!