I saw this advert and thought I would give it a try:
At less than £11 I wasn't expecting much. It arrived yesterday so I put in my car today. It comes with a 3m power lead so you can put it anywhere on the windscreen and run the cable and tuck it away and still reach the power socket. Its also got a rechargeable battery, screen suction mounting kit and a USB Lead.
I stuck in a 2gb SD card I had lying around and I was amazed at how good it is for the money. The sound isn't great but what do you expect for this price.