While you can no longer get one from Apple, the iPhone X is still a fine phone. You can get a refurbished unit for £550 from eBay UK (Good condition, unlocked). That's the 64GB model at least, 256GB storage will set you back £620.
There are also a pair of Earin M-1 truly wireless earbuds for £44, though these have mixed reviews (they won the iF Design Award in 2016 for what it's worth).
Because it's better than the S9
Why would we buy a refurbished 2017 trash phone from Apple when you can buy a brand new 2018 flagship phone like the S9 for around the same price or even less? Only a complete fool or a desperate social climber would buy a refurbished iPhone X..