Constant Work - Quality Needed

DO NOT BID IF YOU DO NOT AGREE TO THE PRICE AND TERMS I need 40 articles for now ....the price is 2$ for 500 words. The whole batch of articles means 80$ and I will pay only after I receive everything - NOT BEFORE OR IN THE MIDDLE OF THE PROJECT. The articles need to pass Copyscape - I will check every one of them and if they don't pass, i won't pay for them. Original work is required - If I am satisfied with the quality, the price can and will increase. The turn-around time needs to be fast, as I have plenty of work for whoever I hire. I need someone who is good with English and who DOESN'T COPY content from other sites. Thank you!