I found this solar powered item on ebay and
it seems to be very nice if you have a long
way to your door:
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=6059896691 (http://partners.webmasterplan.com/click.asp?ref=284148&site=1382&subid=&type=text&tnb=32&diurl=http%3A%2F%2Fadfarm.mediaplex.com%2Fad%2Fck%2F707-3922-3266-17%3Fmpro%3Dhttp%253A%252F%252Fcgi.ebay.de%252Fws%252FeBayISAPI.dll%253FViewItem%2526item%253D6059896691)