I had a question like this last year when I bought a bass from a Talkbass member, it may help you.
http://talkbass.com/forum/showthread.php?t=315091
Edit: I probably should have told you a bit more about it. It was a Fender MM Sig, I had it shipped in seperate boxes, neck off, with USPS.
The boxes arrived at my local post office pretty damaged, as in holes in the box. I guess Customs would have had to look inside of the box, but they sure didn't bother to tape anything up. Luckily the bass wasn't damaged and arrived safely.
I couldn't tell you the exact price of shipping because it was halved with the seller, but it cost me about $40- $50 if I can remember, which is probably less than half, now that I come to think of it.