I am embarrassed to say that I got scammed out of a chunk of change myself. I got suckered in on the "free trial" in newspaperarchives.com and it was during the Thanksgiving holiday season. I called within the timeframe, but they were closed. If I remember right, I had to call within a few days. I didn't realize they meant you had to call on a holiday. They also led me to believe you could pay by the month. I felt rather stupid, but I have learned my lesson. The website isn't worth two cents, yet alone the exorbiant amount of money they charged my credit card.
The moral to this story is - if there is fine print, you better read it! There is a reason it is in fine print.