I know it's pot luck in Cash Generators but I went in to my local one (Accrington) to look for a DVD and ended up finding Red Dead Redemption for £19.99. It has everything with it (Manual & Map) and is extremely good condition. I know it's pre owned but for that price I wasn't willing to let it go considering game and gamestation was selling it for £35 pre owned.
They also had other games in for this price some was bargains others weren't. Either way it's worth a look if you have a local one.