There is a lot of free poser/daz stuff at the following sites. Almost everything listed as usable in Poser can be used in DAZ Studio
sharecg
poserverse
renderosity
evilinnocence
mostdigitalcreations
poserdirect
nerd3D
optitex-dynamiccloth
DAZ3D - EDIT: they now require you to BUY something in order to get the free models
the store at faeriedreams also has some free stuff
Some of the above sites also sell stuff. I do not have a financial affiliation with any of these sites.