I put this in my eBay listings:

SHIPPING: Buyer pays shipping and handling: U.S. $2.99; Canada $7.99; Australia $9.99, and many European countries $9.99. (Note: in January 2013, the US post office more than doubled the rate of sending small First Class International Parcels outside of the U.S.! For example, sending a 3-ounce parcel to Canada, went from formerly $3.30 to now $7.35.) To save you money, I combine shipping on multiple auction wins.

Like in this ebay auction:
http://www.ebay.com/itm/151049942712

Robert