There is GrabCAd, which is free and you'll find wide wide variety of high quality models there but they only focus on 3d models. Then there is 'Shapeways' which is like amazon more or less; probably thingverse that is owned by makerbot, and some people don't like that fact. Try http://alpha.rhombik.com/
it is new and most talked about also do check this link out http://www.spyder3dworld.com/
As far as I know Verbatim company started making filaments, I heard HP were getting into too. You should do your research in this case it's much helpful, best of luck!