they have quite a few bundles on amazon for xone whenever i have a look
http://www.amazon.co.uk/Console-Assassins-Creed-Unity-Black/dp/B00KJFDOYA/ref=sr_1_1?s=videogames&ie=UTF8&qid=1418714818&sr=1-1
prices are well matched for PS/XB in the uk like was said,i guess sony can take the hit here but not in the US as market too big,if MS go lower doubt sony could follow in the UK