This is every single season of 24 dammit!, also includes the mini TV movie Redemption.
I reckon this is a great price. According to billybargain.co.uk £160 is the next best price (amazon).
Shop via Quidco to save a little bit more. (2% of £79.99 = maths that i cant face at this time of night).
I think this boxset is 55 discs! Enjoy