In this June 15, 2018, file photo, cash is fanned out from a wallet in North Andover, Mass. (AP Photo/Elise Amendola, File) As a longtime digital nomad, Nora Dunn has lost a lot of money in the currency exchange game. “I have probably made every mistake in the book along the way,” said Dunn, who shares travel tips and tricks on her The Professional Hobo site and YouTube channel. Making unwise foreign currency choices can happen to even the most experienced traveler.