well I'm not international but...... one place I frequent sends an email to say part of my order is on back order, do I want to wait and send it all together, send what's in now and pay seperate shipping on the back order, or just cancel any part or all of the order. If I do not reply, they hold it till it's all in but that's never been more than a few days. Another place shows on my invoice what's on back order, then I get a surprise in the mail and at the bank! when the rest comes in, it has been 3-4 wks and of course I forgot about it.