I've been waiting months for this to get to a decent price the lowest I've seen it for is £22 second hand at Gamestation and on Amazon.
I saw it today in Tesco Homeplus in Preston for £20, but decided it was still too high and regretted not buying when I got home. Checked online and it's the same price. This is reduced it £17 when using the all too familiar FTSL15-1 code.
Quidco is also available at 8% (tracked at £1.36 bringing the price down to £15.64) and the deal gives 40 Clubcard points.
Hope this if of use, Paul.
This is now unavailable for PS3 online.