I have one similar to the one James has posted above, but without the screen. Mine came from China somewhere and was cheaper than the UK with delivery only being a couple of weeks. Its quite small can be placed at the very top of the windscreen. Its pretty good and accepts a micro SD card upto 32GB to which it automatically records to, I also have it connected up to the screen I use for my reverse camera so I can see live footage or playback when needed. Only thing I have found is that the videos can be a bit jumpy when using playback on a laptop and night version is pretty poor but for the price its great. Also it has a crash sensor or something so that if it triggers it will start to automatically record.
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