All the books for contests, unless I otherwise note, will be shipped from Book Depository directly to the winner. I chose to do it this way because BD often has lower prices than Amazon and it has free shipping.
I've received a few questions about whether or not contests are international - my answer is that it all depends on your country. I can ship the books free to you anywhere but BD often changes the prices for non-US addresses. That makes everything really confusing and frustrating, I know. If you aren't sure if the price for the book is the same to you as it is to the US, just enter but include your country and I'll check myself when I pick the winners.
I hope that clears everything up - let me know if you have any questions.