GameFairs and Army and Navy shops sell it quite cheap.
I braught a few bundles at the Midlands Game fair 2 years ago. It wasnt expensive <img src="http://jsramsbottom.co.uk/bbs/e/icon_biggrin.gif" alt="Big Grin" width="15" height="15"><!--graemlin:-->
CLA Gamefair (Leeds) this weekend aswell.