Bit of a glitch on the Argos website. Just add the Xbox 360 Elite and TWO copies of FIFA World Cup 2010.
Normal Deal: Xbox 360 Elite & FIFA World Cup 2010 for £179.99
Glitched Deal: Xbox 360 Elite & 2 FIFA World Cup 2010 copies for £196.74 (£16.75 for the 2nd copy)
Trade each copy in at CEX for £22 (£5.25 profit for the 2nd copy, £22 for the free copy), which will in simple terms means....
Xbox 360 Elite & FIFA World Cup 2010 - £174.49
Xbox 360 Elite on it's own - £152.49