Due to the price of shipping, the book box will have to be US only.
HOWEVER, I would be willing to make arrangements with potential participants outside the US. In the past, I have sent a list of the books in a book box to a distant BookCrosser for them to select one or two and I have mailed the selected books to them. Then, when their contributions arrived, I moved the box along.
Anyone interested in such an arrangement should send me a PM, preferably before January 1, so that all the swaps can be made in time to move the box out.