I don't know if it even needs to be said but if you don't have any luck finding a free couch/floor, check http://www.airbnb.com/ http://www.airbnb.com/ Plenty

I don't know if it even needs to be said but if you don't have any luck finding a free couch/floor, check http://www.airbnb.com/ http://www.airbnb.com/ Plenty of couches on there for $20/night in SF