10-20 articles per day

I require articles 10-15 articles written and delivered every day. The articles will be of 450 -550 words each and on variety of topics. Since the number of articles will be large, I may choose multiple providers to work on sets of 10-25 articles each every day for next 4-5 weeks. The delivered articles should be in good english, edited, proofread ans as per instructions. Payment will be made upon satisfactory completion of work. If the articles are found to violate copyright laws the project will be cancelled immediately. All articles will have to be as per instructions and pass the copyscape test. I will be shortlisting 5 providers based on the quality of work and cost for my long term requirements. This has the potential to go upto 300-600 articles a week. Since I am offering work in bulk, I expect a price of $3-$3.5 per article. Initial bid should be for a batch of 50 articles to be delivered in 3-4 days. Those who have already worked with us earlier need not apply.