Where can I find totally free scalable vector images and backgrounds for my own (possibly commercial) use?

Hello there,
i"m going to start my new business on free vector. So, i need a huge number of vector files. I got many free vector site in web but almost every site permit individual license. I need commercial license. After worst a long time in web search engine , i have gotten a site that given free vector with commercial license. The site is http://www.rikbp.com/. Please give me more link like rikbp site. Thanks