For my experience anyways wanting to exchange Canadian Dollars the commission rate was around 20% to the market rate. In the other terminal the exchange office was better at 8%. Both rip offs but one better than the other. Use your credit or debit…
Extremely convenient because it's in the hotel, but the rates are terrible. Right now the yen is trading about 108 to 1 USD and they're offering 100 to 1. Unless you're in a hurry I'd recommend elsewhere.