Just Cause 2 for PC will all DLC for £13.44 - ACT FAST as this deal will expire overnight
As part of Zavvi's Mega Monday deal they are selling Just Cause 2 standard edition for £9.99. As part of the installation you will need to activate it with Steam, tying it to your account.
Steam are currently having a 50% off sale on Just Cause 2 this weekend, which is where you can grab the DLC packs for £3.45 (37-80p each).
The Zavvi Mega Monday deal will expire on Monday midnight,
The Steam deal will expire sometime Monday, depending on the timezone they have their servers set to. Assuming they allow for PST to hit midnight, it should be sometime around 9am tomorrow for us in the UK.
So you have about 10 hours or so to take advantage of this price.