Play.com have the "Nexxus Bluemicro Pro V2.0 Bluetooth Dongle" back for just £6.99 on their website. Delivery is free. QuidCo is 4%, if you wish to take it. You may be able to incorporate this with the "RAC" 5% off deal.
Last time this was on HUKD it did brilliantly and was very popular. 4 months on, and this product makes a return - but it's still the cheapest price available as far as I can see!!
At 1.9cm this is arguably the smallest Bluetooth dongle in the world today. Despite its diminuitive size, Bluemicro PRO offers the same super-fast transfer speeds and enhanced connectively as other standard-sized V2.0 Bluetooth adaptors, without the disadvantage of 'bulky' adaptors which often get left at home! Bluemicro PRO's ultra low-profile (only protrudes by 7mm) means that once it's plugged in, it can be left in, making it the ideal solution for those who need Bluetooth connectivity on the move.