Not GOTY but cheapest available at present and Choices UK is pretty much the only place that has it in stock. I've ordered regardless as everywhere seems out of stock for the GOTY at any reasonable price, but this might be of interest to someone if you don't want the extra maps for £5. Hope it helps someone looking for the first Modern Warfare! This is definitely £24.99 INCLUDING delivery.
Call of Duty 4: Modern Warfare (Not GOTY, it seems) £24.99 delivered for Xbox 360