Zombicide cost us, on average $40 to ship an 8lb box to Canada, $50 to Europe and $60 to Australia via USPS Priority Mail, a relatively fast method. Only couriers and Express Mail are faster. We charged $25, so absorbed the rest. Savior pledges will come to about 8lbs with books etc. And no, the price doesn't decrease because we ship 16 lb on Double Savior.
For Europe, this is an added service, we will be paying a 3rd party company to import and unload what is likely to be a partial container, transfer it to a warehouse, store it, pick and pack and send it out. Obviously, they want to get paid, and the general price of packaging materials in the UK is higher than in the US (as is nearly everything, including fuel). After that, UPS throughout Europe will cost us at least 12-15 pounds, (about $20 - $25). This is also not inclusive of potential tax liability, for which we are getting advice that we should probably be paying since we aren't a UK entity. Factor in additional exchange rate risk, because this project is set to ship in May 2013 and $25 is a steal, with $35 to $40 being closer to a fair price.
So international backers, sorry the price can't come down, and is as reasonable as we can make it. If anything, it's the US backer that's subsidizing you, not the other way round (it cost us $11 to ship it by Fedex Smartpost in the USA). And for the love of unholy Darkspace, US backers please don't write in asking not to subsidize the international lot!