I was looking for FIFA 14 on the Xbox 360 for my lad (yes I know FIFA 15 is out in September). It was £25 pre-owned in Grainger Games. I reserved it online and collected it in store.
As people have already stated, it is £20 on Amazon, but if you want it now, then you can pay the £3 extra and pick it up. My lad doesn't play football games all the time, so FIFA 14 will do; as I won't pay £40+ for FIFA 15. I believe this is the cheapest on the high street (not online).