We use First Class International whenever possible--great price reasonable service. See here for help with rates, shipping labels & more:
~~Shipping Basics~~
http://www.etsy.com/teams/7722/business-topics/discuss/10577585I know lots of folks like the the flat rate packaging because it's easy, but unless you are using the small Priority flat rate box or envelope, you will likely be paying too much to ship-. Your items have to be heavy (a few pounds) for the medium or large boxes to be a good deal.
Even using the small flate box is more than you need to spend for international mail for light items:
3 oz First Class International for the most expensive region is only $4.56, where the international small flat rate box ranges from $12.95 to $16.95.
More than double the price, and it is treated exactly the same as First Class once it leaves the US.