I know its a preowned deal and it will be store specific but may help someone. Cash Generator in Neath are selling Xbox One console for £149.99 which I thought is a decent price.
I checked their website and it seems other stores are selling it for a similar price, so it may be worth calling ahead to your local store if you are on the lookout for one. The link takes you to an example in the Norris Green store not the Neath store. The Neath store has about 5 consoles.
Microsoft Xbox One 500GB Console Comes Complete With 1x Wireless Controller, HDMI Lead, Power Adapter
Hope it helps someone one