Write 30 SEO Articles of 500 Word Each

I need 30 SEO written articles of 500 Words each, with a keyword density of at least 3%. The articles are on the topic of internet and affiliate marketing and the exact keywords will be given to the winning bidder. I am looking for professional article writers. I am willing to pay up to $2.00 per 500 word article, and I am planning to get 30 articles written. This will be the first of many, and if the articles are spot on, we can negotiate a better deal for the two of us - more articles written for me, more money paid to you (I will then be offering only you more money per article). Recapping: Please be sure that the articles are Search Engine Optimized (SEO), the articles need to be informative to the reader with 100% correct grammar and punctuation, the articles will need to be concise and to the point, the articles must be 100% unique and original, as they will be reviewed through Copyscape and plagiarism detection programs. Side note: Articles need to written within 3 days. That's it. Thanks.