I am searching for some good article providers for an upcoming service that we will launch in the next 10-15 days. We need fast turnaround. Our packages have between 5 and 15 articles but we also give the oportunity for the clients for customers to add further articles to the orders up to 50 unique articles. The articles must be copyscape passed and also seo optimized. Please provide us with a price per article and turnaround time for 5-7-9-15 articles. Also please provide a turnaround and price for 20-30-40-50 articles. Thank you in advance, we might require some examples of previous work.