Oh see, you can do it in the website.
In tenso you have to pay a fee for the weight of the package and then the shiping with EMS
for example:
2 RnRC album - 3,990Y + 3,150Y
shipping to Tenso - 500Y
Fee for weight - 980Y (1,160g <- CD+DVD & CD only & 2 posters & 2 boxes with mobile stands)
shiping EMS - 3,250Y
Total: 11,870Y
But well if you wanna know just the costs of Tenso it's 3250 + 980 = 4,230Y (37€)
But both the EMS fee and the wight fee changes, in the website you can see the prices and even calculate it ^^:
http://www.tenso.com/en/guide/fee/index.html