To calculate shipping with the US Postal Service (very reliable), go to the following website
http://www.usps.com/tools/calculatep...lculatepostage and select international shipping. There are many options, from very basic sea shipping to global express mail (very expensive).
To be even more safe, you can try a commercial courier (DHL, UPS), but for anything other than documents from the US, they tend to be quite expensive. I believe it costs about $85 to send 2lbs from US to Europe.