Seems to retail at anything from £23 to about £50 elsewhere on the net.
Have checked stock and there is some in a couple of Bristol stores and in the south west area.
Item number: 546/6175.
Iqua SUN - Bluetooth® Wireless Headsethttp://www.iqua.com/products_sub.php?navi_id=1476
Iqua SUN - the first solar-powered Bluetooth headset in the world. This wireless headset has got a photovoltaic cell that uses any available light - outdoors and indoors - to charge itself and extend the operation times of the headset. After all, why use electricity when you have the sun?
Additionally, you can answer or end a call, redial and use voice dial and even switch the call between phone and your headset using a single button! With Iqua SUN, you can enjoy a crystal clear sound and wireless VOIP calls, at your convenience.
This innovative and groundbreaking combination of science and style led the Iqua SUN to be selected as an Innovations 2008 Design and Engineering Award honoree in the Wireless Handsets Accessories product category. Iqua is proud to see itself leading the way in promoting environmental awareness in the mobile technology industry.
Review here seems to suggest its pretty decent unless its windy for obvious reasons: http://tech-reviews.co.uk/reviews/iqua-sun-bluetooth-headset/