The link is not working anymore. But there are a lot of other videos and articles about the subject. Just a warning, be careful about buying bump keys, especially online. In some areas, it's illegal to send and receive lock picking tools over the mail.
This is why most people just choose to make one. All you need to do is to buy a blank key and then file it down to its maximum depth. An old, unused key also works just fine. That's what I did when I tried it out myself to see what the fuss is all about. Needless to say, I changed all my locks. It was an expensive investment but nothing can replace the peace of mind that security brings.
This site has a lot of free articles and videos about how to bump a lock. Knowledge is very important so we can keep up with these crooks.