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Mugs, tees, mousepads, etc. at Printfection http://www.printfection.com/karadin/ ships international, and unlike other product-on-demand sites, does not charge extra because all their goods come from one place, great quality as well!
Prints, greeting cards and postcards at Deviant Art http://www.deviantart.com/print/18214140/
*note - watermarks are not shown on merchandise for sale, the second image 'Compassion' is devoted solely to fundraising efforts, so come back in a month, or a year, it will still be available.