I was walking past one of those cheap magazine market stalls earlier and I bought an old copy of DVD review out of curiosity because it came with a guide to Avatar's Pandora for a quid. I expected it to be this hackily-written thing that just regurgitated the movie but it's really not. It's about 200 pages, written by the academics that informed the film with assistance from Landau and Cameron, on loads of different aspects from the environment to flora and animals, and the detail on all of the stuff is just staggering (most of which was never even seen in the film, or only for a couple of seconds without being expanded on). Seriously impressive, for a quid at least.