Used one of these last week and was amazed at the build quality compared to the MadCatz stuff I usually buy - so was casually looking for a deal on one of these. Then this landed in my inbox this evening from overclockers.
Still £179 from Razer store here - http://www.razerzone.com/gb-en/gaming-controllers/razer-atrox-xbox-one
Cheaper in other places, but average used price on eBay is £100, new for £130. Camelcamelcamel uk lists lowest at £122.23 on Amazon.
I've personally found Overclockers to be great but I know they split opinion.
Anyway, hopefully somebody finds this useful