Bear with me on this one, it is a bit long winded but the best that I could find for the bundle I was looking for which is a GTA 5 with the the PS4.
Directtvs have a PS4 bundled with GTA 5 and Little Big Planet 3 for £340. They all you to get a £15 discount if you sign u for a £1 Which? trial. So the bundle is £340 + £1 - £15 = £326. Then add on £9.95 postage, £335.95.
You can sell LBP 3 for £18 cash to CEX. You also get 2.1% TCB. So you would get back £18 + £6.50 TCB = £24.50
So total deal is £335.95 - £24.50 = £311.45
Hopefully someone can make use of it. An sense of it I suppose