$4.15Sewing Patterns for Face Masks: A Complete Guide with Illustrations on Making Reusable and Washable Masks as Protection Against Infection, Virus, and Respiratory Diseases (DIY - Homemade)Amazon- $2.99RESPIRATORY AND FACE MASKS: Which Masks Are Better Able to Protect You from Viruses? A Practical Guide on How to Choose the Right Protection Against Every Virus and Infection.Amazon