I have one of these for my Dogcam. I managed to get a good deal on
eBay for the actual 405, but yes you do need the Travel Adapter in order to be able to record video - this does, however, also double as a charger in addition to the USB charger built into the 405.
However, I haven't needed the docking station for anything (I haven't got one)? Unless it is for playing it back on TV? Personally I record to SD card and play it back on my laptop.
What are the codecs for Peanut that need downloading? I've not noticed anything missing/not functioning without them, but if they improve quality etc. I would like to know where to get these?