I've been monitoring the price of this film for some time as I am after the Blu-Ray (currently £8.45). This is the cheapest I have seen the DVD release on sale (it has been holding at £4.99 for some time now). As for the film, some love it and some hate it, it seems. I personally subscribe to the former and think Knowing is an excellent film (even if the ending is a bit 'unexpected'!).
Nicolas Cage (National Treasure: Book of Secrets, Leaving Las Vegas) stars in Knowing; a gripping action-thriller of global proportions about a professor who stumbles on terrifying predictions about the future and sets out to prevent them from coming true.