Spigen SGP Leather Pouch [UK]
I got the Samsung Galaxy nexus Spigen SGP brown leather pouch from Amazon UK and its a perfect fit.
The nexus is the same dimesions, except its 2mm less wide, this makes the one x have a really snug fit in the cases made for the nexus.
costs 22 GBP from Amazon here:
Brown and black leather available. Very very nice case, really slim, doesn't add much bulk, easily protect against scratches and bumps. Corners are strong to protect against stronger falls. Exit strap feels solid and has a nice magnet on it to stop the tag flapping about in your pocket.
10/10 as far as i am concerned.
The pouches are also available from the USA spigen website for 40 USD plus another 10 USD for international shipping.
Some pics are attached.