Asos.com has free international shipping!!
As long as you use the UK version of the site they will ship it for free...and with no limits on how much you need to spend.
I haven't done it yet as a friend just told me about it today but I was on the site looking at maternity clothes and their sale/outlet section actually has more choices than the regular maternity section. They also have a plus sized section called Curve (I was looking to see if there was anything I could use as maternity)
Anyway, for anyone else living in a country where it is hard to find sizes and clothes you like this could be a lifesaver!
You can also change the currency from pounds to US$ or Canadian $ so you know how much you are spending (if not too sure the conversion from pounds)