One of the oldest and most respected communities, Renderosity hosts a massive marketplace. It is particularly famous for its "Marketplace Freebies" section, which is a goldmine for beginners looking to build their library without spending money. The forum community is also active, often providing support for installation issues.
Many top Daz vendors (the creators of the models) have personal websites where they offer "samplers." For example, a vendor selling a 50-outfit clothing pack Daz Studio Models Download--