It might be worth waiting to see if the price wars between the various retailers heats up any more, but the best price for pre-ordering Ni No Kuni (due out on 25th Jan) is currently Zavvi.
– if you use the voucher code HG2013 to get 10% off (the code is helpfully displayed right there on the product page in case you forget it), you can currently pre-order this gorgeous JRPG for £31.46
I've not seen it anything like this cheap anywhere else. Yet...
Bioshock Ultimate Rapture Edition is out on the 8th Feb, it includes Bioshock and Bioshock 2 aswell as all the DLC that was released for both games including Minervas Den for Bioshock 2 which is meant to be awesome along with some special Bioshock Infinite extras.
Its on Shopto.net for £13.85 which is a great price considering what you get in the package