"This thing is out of control and there's no end in sight," said Christopher Elliott, a consumer advocate and author of "How to be the World's Smartest Traveler." "The practice is extremely deceptive. But the hotel industry is not only doing this, they're doing this increasingly aggressively." Consider a consumer attempting to book an "Express Deal" for a four-star Las Vegas hotel on Priceline.com. Four hotels in this category were recently advertising bargain-basement rates of less than $50 a night, one for as little as $33. But consumers who clicked through to book one of these super-cheap rooms would find add-on fees at three of the four hotels. Indeed, the supposedly cheapest offering -- the room advertised at $33 -- tacked on an "additional mandatory fee" of $28, boosting the real room rate by 85 percent. A Priceline spokeswoman says the practice of tacking added fees onto the advertised price after a hotel is selected is not deceptive. Consumers are notified of the additional fee and the total cost of the booking, including the added fee, when they're still able to back out of the deal. Get the full story at CBS News