Just drifting back to Turbosquid... They do have some free stuff. You have to be careful about what you can import into Poser, and about scale effects when you do. Some of the free stuff is good, some is barely adequate for background use. It may only be halfway to what you need. For instance, many material groups, but no texture maps. Have a look and try some stuff out, if you're a novice. You'll learn a bit about using Poser, at least. Some of the paid-for stuff is available elsewhere for less, possibly direct from the artist.