Cracking price I found in-store at ToysRUs at the Thurrock Lakeside branch. There were around 6 or 7 sealed copies on the shelf as part of a limited time offer. Best online price I found was in the region of £14, but that was a few weeks ago, chances are it's a little higher now.
For those unfamiliar with the title or C&C range of games the description is as follows:
In the name of Kane! The Command & Conquer series continues to thrive with Command & Conquer 3: Kane's Wrath. As the expansion pack to the critically-acclaimed and fan favorite, Command & Conquer 3 Tiberium Wars, this Real-time Strategy (RTS) game returns to the Tiberium Universe with Kane at the center of an epic new single player campaign spanning 20 years - from the rebirth of the Brotherhood of Nod after the Second Tiberium War through the dramatic events of the Third Tiberium War and beyond. This story will be told through a new set of high-definition, live action video sequences starring a celebrity cast including Joe Kucan, playing the megalomaniac leader of the Brotherhood of Nod, alongside new talent Natasha Henstridge and Carl Lumbly. With your help, Commander, the Dark Messiah may rise again!