http://www.play.com/PC/PCs/4-/3518885/Cat5e-Single-Socket-RJ45-Ethernet-Network-Face-Plate/Product.html?ptsl=1&ob=Price&fb=0&&_$ja=tsid:11518|cc:|prd:3518885|cat:Networking
(that's a single mind)
Can be had much cheaper than prices quoted.
Go to a nearby electronics store, they will cut you some cat 5 for a couple of quid (I have spool of 300M that cost less than £30).