I used a Chase credit card, which charged me the exchange rate at the time of purchase +1%. It wasn't too bad, cos I wasn't making HUGE purchases.
Also check out this post and the responses:
newcomer link: http://www.fatwallet.com/t/52/537027 [nonactive]
newcomer link: http://www.fatwallet.com/t/52/272730 [nonactive]
Good luck! I just got a credit card for 0% purchases for a while, screwing my credit history but saving my neck in the short term.