Cheapest to buy new is £12.95 at Zavvi: http://www.zavvi.com/games/platforms/xbox-360/2010-fifa-world-cup/10076660.html
Was previously part of the 2 for £20 / £12.99 each at Gamestation, now part of the 4 for £20 / £7.99
Bargain at £7.99, even more so at £5 when bought with 3 other games.
Appears to be instore only as online has it out of stock & listed at £12.99 still.
Gamestation in Warrington