Article Writing Long Term

I require 100 articles at the moment. Depending on the quality of the articles and price this 100 could be upgraded to 150 articles per month. I am looking to pay no more then $150 per month. Each article will be only 250-300 words long so these are easy to write. I will supply the keywords and topics for each article. I will need the articles as soon as possible, 30-40 per week. ALL ARTICLES must be original. This is a long term job. I will have at least this much work each and every month with the hopes of expanding. Please include a copy of your work as well as the details of your pricing. I have had bad experiences with writers leaving me hanging in the past. Please, only serious and committed people apply. Please include your bid per 100 articles as well as your bid per article. REMEMBER this is a long term position.