People are spending overseas and being hit with additional costs on their cards that they are unaware of at the time of purchase.

Aussie today launched a new credit card designed to help save online shoppers on overseas sites some of the estimated millions of dollars in international transaction fees they currently pay each year.

The estimated 8 million Australian who travel overseas this year could be big winners from today's launch of the new MasterCard® card by the country's leading non-bank financial services group, Aussie.