Probably no where. You might find a couple of sites that give you a couple of minutes of one lesson free (usually called a sample).
If tab with audio will do you can find lots of free lessons at www.wholenote.com. I would also suggest going to a search engine like
www.yahoo.com and searching for "guitar lessons"

Jim in Canada [url=http://www.mp3.com/jimgraham]My MP3 page[/url]

: Where can I get free guitar lessons online that are on video