Hello from Canada!
This project sounds like it would be fun and interesting for me! I can provide you with 4 original, engaging articles, minimum 600 words on your subject matter of choice. (Please note I have a 100% completion rate and the 91% and 86% posted this week is a glitch on Freelancer's end that they continually need to fix).
Your $30/2 weeks or $60/month deposit sounds fine. (the pre-sets on the bidding process do allow me to reflect that above) Would you at all consider covering the Freelancer fees on my end so that I would "clear" $7.50 per article?
I have a health related background (please see my portfolio to review my resume and excellent feedback) however, I have written on everything from landscaping ideas, pregnancy, herbs, gardening, forklifts, dental, physiotherapy etc.
Thank you for taking the time to consider my bid. I look forward to hearing from you soon!
With gratitude, piscespoet21