Don’t fall for these 5 infomercial money-grabbing tricks

Infomercials that sell shampoos, zit creams and the latest weight loss gadgets can be hard to turn away from. But before you pick up that phone, you should know that the low, low prices and easy monthly payments advertised are not always what you'll pay.

"There are many problems with infomercials," says Edgar Dworsky, the editor of consumer resource guide ConsumerWorld.org. "Not all of them are misleading, but many are."

Leaving aside whether the miracle products really work as advertised (some do, but always check out online reviews at Amazon.com or elsewhere), you have to be careful and aware that the $19.95 price touted often will wind up being a lot more. Here's what to look out for:

Stealth subscriptions! • Get real close to the TV and read the fine print: Some marketers will automatically put customers on a subscription plan. That means customers will be charged periodically to ship products. This is especially common from those hawking face creams, hair conditioners and other beauty products. In the infomercial, a warning is often written in tiny print under the price, says Dworsky, who also edits MousePrint.org, which exposes the fine print in advertising.

Easy payments —that add up ! • Break out the calculator: Expensive gadgets are sometimes broken up into "easy payments" that makes the product seem cheaper. They might say, for example, that you'll pay $39.95 in four easy payments, adding up to $160.

Buy one get one (not) free • Freebies can be far from free. A "free second item" can sometimes come with high processing fees. Before making a purchase, customers should call and ask the company what the total charges will be, including shipping, handling and fees, says Dworsky.

Upsell ! Upsell ! Upsell ! • If you buy a product online or through the phone, you may be pushed to buy extra products you don't need. If you fall for it, you'll also likely pay extra processing, handling and shipping costs, pushing your bill even higher.

"Trial" period for a price! • Be aware that free trials aren't forever (and sometimes trials aren't free), and ask what the cost would be if you decide to keep the product. "The price shown is often just the price of trying the product," says Dworsky. "If you want to keep it, a much higher price is charged."