And next tonight, our real money team is back to help you plan a last-minute summer vacation and save hundreds of dollars. Families booking trips in the final two weeks before labor day. Did you know... See More
And next tonight, our real money team is back to help you plan a last-minute summer vacation and save hundreds of dollars. Families booking trips in the final two weeks before labor day. Did you know that you can accept a kind of spy mission and relax at the same time? ABC's Paula Faris shows you how to put money in your pocket. Reporter: Rebecca, Mike and 2-year-old Veronica are about to go on summer vacation for practically free. We're here to check in. Reporter: How? They're mystery shoppers, as many as 1 million of them in America right now. Sent in by companies to make sure everything is running smoothly. If I wasn't mystery shopping, I don't even know how we would pay full price for these things. Reporter: Free newspapers for guests. 24-hour business and fitness centers. They all check out. But the pillows in the lob bi -- messy. This is what you don't like right here? Reporter: And there's sand all over the carpet steps. Everything gets documented on this score sheet. Reporter: So far, what would you say about this experience? I would say that the service is friendly. Maybe a little bit slow. Reporter: Upstairs, the ice machine looks good, but the vending machine is out of order. Here's our room. Reporter: Inside -- Now, I'm going to go ahead and inspect the linens here. Reporter: That's where Rebecca finds a tiny stain. In the bathroom, testing the hair dryer. In the end, the family givens the hotel a thumb's up. They say they'll do about 150 mystery shops this year, saving their family about $5,000 in expenses they would have bought anyway. David Lipton, president of a mystery shopping company, says be wary of companies asking you to pay them money up front. The most successful mystery shoppers are the ones who are reliable, responsible, they have a keen eye for detail. Reporter: Back at the beach, verronica and her folks, all done digging up yet another mystery shop. Give me a high five, too. Paula Faris, ABC news, corpus Chris Christi. And when we come back -- ? and you're gonna hear me roar ? Katy Perry and her hit "Roar." What she, Rihanna and cold play were reportedly asked to do that has never happened before in our "Instant index." This is Charlie.
This transcript has been automatically generated and may not be 100% accurate.