Been after one of these for ages and this is the cheapest I have seen. Nikkai GPS Travel Tracker, product code A21HT. It's actually a Mobile Action i-gotU GT-100, best price elsewhere £35. Picked one up in the clearance section at Maplin in Aintree (Liverpool) - not found on the website so presumably discontinued and may be difficult to find.
* Small design with advanced power-saving function
* Auto-map your photos with GPS location information
* Compatible with all digital cameras and camera phones, coolest GPS tracking gadget for your journey
* Organize and present your journey in three-dimensional Google Maps and Google Earth
* Create and share your live travel blog on-line with all your friends quick and easy
* 3D Virtual Reality Travel Blogs on @trip are viewable on Windows and Mac computers
* Share your own @trip journal or your favorite trips with your social networks on Facebook, MySpace, Digg, Delicious, StumbleUpon, Google Bookmarks and Yahoo Bookmarks....etc.
* Export into multiple file formats (GPX, MHT or KMZ)
* Automatically upload photos to popular web album like Picasa and Flickr
* Water-resist hardware design, suitable for rainy days, skiing, water sports
* Compatible to third party GPS navigation software, can be used as Bluetooth GPS Receiver for your PDA or mobile phone
Full details at:http://global.mobileaction.com/product/product_i-gotU_GT-100.jsp