I live in Canada, and I received the case without paying anything extra. I'm pretty sure I didn't even pay sales tax (was never asked to).
They mark the value of the case on the box...my $45 case was marked at like 27$ or something (the rest being their profit...so they say..)
I didn't have to pay duties and taxes, and I'm in Canada, the most anal country when it comes to this stuff. So being in the US I wouldn't worry too much.
Thank you so much for your reply. I just don't want my Sister to have to dish out any of her own money to pay for something I ordered. I live in an apartment, and I just don't trust having something delivered here, and having the delivery man just leave it outside the door. It amazes me that they do this, but, it happens all the time, and the risk is that someone else will just take your stuff. So, I am having it delivered to her house, just to be on the safe side.