You can get the Goji Armband LED Light for £1.99 when purchased with selected activity trackers.
Starting with the cheapest,
* GOJI GO Activity Tracker (Black/Purple/Grey) SMALL @ £19
* MISFIT Flash Fitness Activity Tracker - Onyx @ £24.99
* JAWBONE UP2 Activity Tracker - Oat Spectrum Rope/Gunmetal Hex Rope @ £27.99
* FITBIT Zip Activity Tracker - Charcoal @ £39.99
& MANY OTHERS at £49.99 and upwards. (Just type activity tracker in the CURRYS/PC World Searchbar to see which ones qualify)