We all do it: putting off the changing of money until the last minute when we're travelling overseas. For some, it's because we want to get the best rate possible, and for others, it's just the last thing we think about. But we're all getting hit with a hidden travel tax - that nice little earner for foreign exchange agencies called commission. Whether you're going travelling or just sending money out of the country, we can tell you where those fees and commissions are hidden - and how to avoid them.