Freelance Writing on Three subjects

I need someone who can write articles (450-550 words) with specific keywords I specify for three subjects. The subjects are: wedding, home improvement & Christmas. The articles needs to have the keyword density for the specific keyword around 3%. These articles are for search engines, need someone who is familiar with HTML and search engines. All articles needs to be ORIGINAL. I'll check each article for duplicate content through different tools in my possession. I need someone who can produce a lot of articles. Please give me a quote per article, I'm looking for someone to produce 3-5 article per week to start, then if the articles are good, there will be a lot more thereafter.