Tesco are offering the Rambo  DVD for £9.00 including delivery on their Entertainment site. Not sure if you can get the same deal in store. It is Region 2.
It was only released on 23rd June 2008.
Amazon.co.uk - £12.98 (excluding delivery)
Play.com (UK) - £12.99 (including delivery)
CD-WOW (UK) - £12.99 (including delivery)