Jarhead is £8.99 @ CDWow, which is the cheapest on the web. If you follow the link through the "Go to deal" button, this will activate an automatic £1 off, giving you this DVD for £7.99. When you get to the site, search for "Jarhead" and select the region 2 edition.
Alternatively, you could get it for £6.99 if you still have one of the £2 vouchers from the world cup promo.
Details: In the summer of 1990, Anthony Swofford, a 20-year-old third-generation enlistee, got sent to the deserts of Saudi Arabia to fight in the first Gulf War. In 2003, his memories of that time in that place became the best-selling book Jarhead. Swofford wrote with the urgency, immediacy, honesty and humor that could only come from someone who had lived through the experience itself. Swofford's book spent nine weeks on The New York Times list of best sellers and was hailed in that same publication as "some kind of classic…a bracing memoir of the 1991 Persian Gulf War that will go down with the best books ever written about military life. A wild passage familiar to millions of young men but rarely so well revealed."