Not familiar with Swedish credit policy but there are "Secured" Visas that you put money on before you use them. You secure the card by pre-paying but it's kind of like you need a balance. 20 dollars of credit requires 40 dollars and you leave 20 on the card to spend 20. There are many brands but maybe the VBV has a qualified international vendors list on their site.
http://usa.visa.com/personal/cards/card_providers.jsp
XI Wiki



