Microsoft's Xbox One is going to cost £399, if a retailer leak is to be believed. Though Microsoft has just announced the Xbox One, it hasn't yet officially revealed the price of the next-gen Xbox. UK-retailer Zavvi, however, has gone live with its pre-order scheme, revealing the price of the Xbox One in the UK to be £400. Though this could be an estimate on Zavvi's part, it ties in with Paul Thurrott's claims that the Xbox One will cost around in the US. Source Now Gamer.