Was stickering the 4 copies we had of this up at 98p at work today and bought a couple for me and a friend - great game for under a quid!
May want to call stores up in advance in order to check stock. Failing that, the game was in the 2 for £10 PC section so take it up to the till and ask them to check the price if it's still in the multibuy!
Can provide receipt proof if necessary but I doubt it is..!
Good luck :D