I personally think the one source that is best over the Companion book or the CBS "Official" website is a little something called ... *drum roll, please* ,,, CSIFiles.com. It has the episode guides, cast lists, and reviews for all three series, lots of pictures in the character/main cast threads, latest news, and this neat message board to discuss it. But the Companion book is handy to show off or read in bed. Originally released at $25.00 (US dollars), Amazon.com has it for $15.75 and you get free shipping if you buy over $25.00 in various merchandise in one order to one address. They can also show you some of their associated used-book vendors that have it from $4.31 and up. And like another reply said, you can check with your local library to see if they loan it out (as if anyone would want to return it).