TOO GOOD TO BE TRUE�? EVERYTHING CONSUMERS NEEDS TO KNOW ABOUT SEVERAL POPULAR PRODUCTS AND SERVICES, WITH HIDDEN CAMERA INVESTIGATIONS, ON "20/20," FRIDAY, APRIL 11

Plus: What Do You Consume in a Lifetime? Elizabeth Vargas Previews Her National Geographic Special, "Human Footprint"

Promises of becoming healthier by applying a foot pad, of having a better body with "lunchtime lipo," or even enjoying a first-rate luxury vacation that won't bust the budget, these are all enticing ideas to even the most savvy consumer. But what's real and what's too good to be true? And can you really save money on everything from groceries to clothes almost every time you shop? "20/20" sorts fact from fiction, FRIDAY, APRIL 11 (10:00-11:00 p.m., ET) on the ABC Television Network. Additionally, Elizabeth Vargas reports on her upcoming National Geographic special, "The Human Footprint."

Who wouldn't want to be treated like a king or queen, staying in a palatial room at a luxury hotel and not break the bank? Big promises from a new version of the complaint-riddled time-share business guarantee to provide a lifetime of luxury vacations at low cost. But is it a vacation package filled with overblown promises? Jim Avila reports in a hidden camera investigation.

And: Ever think you could get a better price on a digital camera, or on a shirt from a national department store? How about paying less than full price for vegetables at your grocery store? As Bill Ritter reports, prices are negotiable almost anywhere if you follow the tips from "haggling" experts.

Also: Known as "lunchtime lipo," lipodissolve claims to melt away fat with a needle, a seemingly great alternative to risky liposuction surgery. But are the claims too good to be true? And is it safe? Deborah Roberts reports.

Plus: Imagine being able to detoxify your body while you're sleeping just by applying special foot pads. That is an offer thousands of people can't refuse. Sound too good to be true? "20/20" puts the detox foot pads to the test. John Stossel reports.

Additionally: It's hard to imagine what one person consumes in a lifetime, from all of the food and natural resources, to all of the clothes, bath products and electronics. And, according to the Global Footprint Network, if the rest of the world consumed at the rate Americans do, we would need five planets' worth of resources. Our human footprint is indeed huge. In conjunction with a Wildlife Conservation Society/National Geographic special airing Sunday entitled "The Human Footprint," Elizabeth Vargas reports on what the average American consumes in a lifetime, and meets one person who's trying to reduce our footprint by building green homes of the future -- today.

"20/20" is anchored by Elizabeth Vargas and John Stossel. David Sloan is executive producer.