Been Verified is, or was supposed to be free for seven days (I haven't checked lately) Its normally said that "you get what you pay for" but if you don't need to use a service like this for more than a week, its obviously a great deal as free trials tend to be. This is also the only instant background check I know of that has a commercial.
You've got to be older than age 18 to use this service, which is part of why a credit card is needed. They also don't want you to use the the free trial more than once.
You could check out some related apps for your android or kindle device. I've found that the Been Verified app works pretty well.