Cheapest I can find the Nike+ Sportband 2 for! They are normally £30-40. The site has them quoted for £32.99-£36.99 but apply the 20% discount code to get the below
The Grey/Pink or Grey Blue are at £26.39 with the code
The Black/Yellow or Black/Red are at £29.59 with the code
(you can see all 4 here: http://www.sportdiscount.com/elysium.search?search=sportband)
Code: Running20 for 20% off
Don't forget Quidco!
Code expires on FRIDAY the 10th of June