For this to work u need to do 2 things, first check your local morrisons have a copy of the game in stock first of all.
If they have visit your local PC world ( within 30 miles of the morrisons store u rang) and inform them that morrisons are selling for £25, and they will match the price plus knock off 10% making it £22.50.
*** The game must be in stock in your local morrisons for this to work ***
There is currently no info that the xbox 360 version is at this price. it must be selling more or something but its weird how they have only got one console listed at this price!!
PHOTOPROOF OF THE PS3 PRICE ON THIS LINK:http://www.hotukdeals.com/item/253587/showthread.php?t=253587&page=2
props to Jack-L92 for the piccies