EDIT: Well the sale has ended, but you can nab a copy in the UK for £8 here and it is the Collectors Edition (actual box, may take a few days to arrive) so you'll get a free mount, huge bag, map etc.
Or for the Americans (or anyone really, since the game is not region restricted) you can get it for $5 on Amazon, or $7.50 for the Ashes edition (spider mount)