Zapped I think is the original however it cant be examined after.
Paul Wilson tweeked the trick and re-named it Fan-2-C and it can be examined.
Its on his website
If its edited out just google Fan-2-C and you will find it. It is only sold on Pauls site and is fully examinable. Also, its only buyable as an instant download.
I had the same question just the other day so I did some research. I also found a forum in my search where Paul Wilson himself made some posts and mentioned they are currently working on making the trick availible in stores. But no mention of when and that post was in Oct/04.
I plan on getting it eventualy as it looks great.