The original edition already was reprinted by Warner Books as a paperback, but those reprints are also long out of print and hard to find.
The book, while really funny and an interesting read, is not worth $300 to the average person. It is more humor and parody than anything else. What makes it so collectible is the fact that Ricky had a nude model demonstrate the grips and throwing techniques. To the best of my knowledge, I don't think there ever has been nudity in a magic book before. (If you can consider it a magic book). If you really want to learn how to throw cards, there are other sources in magic where you can learn this feat, but you won't get to see pictures of a nude model demonstrating how it is done. It is worth $300 to a hard core magic collector, but not anyone else. I would never sell mine.