Game trade in of the week is Mario vs Donkey Kong on DS this week. Offering £25 trade + 2000 points (£5) = £30
Zavvi are currently selling this for £17.85 + 3.5% quidco. Quidco also has a £4 off £40 voucher on site.
Maybe worth buying and trading in a couple for £60 credit for £32 outlay.