I finally took the plunge and purchased an entertainment book. I purchased it for $15 with $6 cashback through eBates. When I was checking out, there was the option to save an additional $5 by signing up to order a book every year. I opted out of that offer because I've never owned one before. I'm unsure about how much I'll actually use the book. I'll post about my book (and how much I use it) after I receive it.I purchased the book because I'm curious. Since most of my friends are...