Was going to trade a couple of games in at CEX this morning, only surprise, surprise they had no cash. Which was fortuate for me as Gamestation have 50% extra on cash trades for a limited time only.
It was the Southampton store i went in to, though bloke there said it was all stores, but they don't know when the offers ends.
I traded in Blue Dragon, and Lego Star Wars Trilogy for £30 cash - I only paid a tenner for each of these games new (Blue Dragon @ Comet & Star Wars @ Ebay).
This makes them the best value cash trade in retailer on the high street at the moment.
I know you could possiably get more for your games on ebay, but if you want some cash quick - Gamestation's the place to go.
Plus they don't run out of cash :)