We've been taking a lot of calls lately about a scam involving the weight loss product Acai Berry. Many of you tell us, you've seen ads for free trials of the product online, but when you sign up, it ends up costing you hundreds.

Here's how the scam works. The site claims you need to pay a shipping fee to get your "free" sample, but once you give up you credit or debit card number, they instantly charge you not only for that shipping, but for a monthly membership to their site.