for free cars probably your best mesh would be to get the mercedes 600 made by deespona free (on turbosquid though if it is max format youd have to get round it - ie max 6 demo convert to 3ds then poser import) if you have c4d try http://129.125.101.174/c4dportal/default.asp there are approx 130 cars / bikes in c4d format