Grand Theft Auto 5, Xbox 360 – £24.55
Grand Theft Auto 5, Xbox 360 – £24.55 delivered
Gamestop are running an offer where they will sell you GTA5 for £4.97, plus two trade-ins from a selection listed here.
Included in the selection to trade in are Little Big Planet Mario Kart & Alien Breed Trilogy.
If you buy these two games, and then use them in conjunction with this trade in offer, you will be paying a total of £26.95 for GTA5. Obviously if you own any games from that selection that you already want to trade in, that might be a better option.
If either of these two games go out of stock, Metal Gear Solid: Snake Eater is the next cheaper (apply coupon “SUMMER5”).

just a quick update, if you want to get both fifa 14 and GTA V you can use game.co.uk 3 for 2 on preowned games deal to save even more. I got two copies of forza 4 and arkham city for £22 total. I also bought f1 2012 from ebay for £5 for a total of £27.
add on the £10.94 which isn’t refundable for a total of £37.94 for both fifa and gta, making it £18.97 per title. you can probably save even more if you scout through the 3 for 2 deal for the best options.