Oh, so you watch "America's Got Talent" too. This was just performed on a recent episode.
The trick that you are seeking is called "Cardiographic" by Martin Lewis.
It's not available at PM, but it is still out there...check the 'net'
The 'regular' version costs about $145.00 USD. The 'signature' version will cost you about $195.00 USD.
Anything less is crap ;-)
Good luck