If you're interested in getting one of these, Amazon currently have them in black for £18 delivered with Prime (or free delivery over £20 for those without Prime).
RRP is £29.99 and they seem to be from £27.99 upwards from other shops online. It's only the black version that is at this price on Amazon, the other versions are all still at full price.
I also had a quick look on CamelCamelCamel and it is the cheapest this item has been to-date on Amazon.
Hope this helps.
**Edit** I've removed the Product description from Amazon. Please read it there if you're interested in getting one.