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Remember taking those interstate trips when you were a kid and picking up the Hotel Coupon book? Years later that very same book is still around but in the form of a handy smart phone app as well. We talk to Mark Novak with Hotel Coupons about app, the low rates and what it means for travelers. Travel expert Jason Coleman answers listener travel questions on: water in\xa0Mexico, traveling with a healthy immune system and traveling overseas and getting vaccinated.