Amazon.com has 3M Rugged Quick Latch Half Facepiece Reusable Respirator (Medium) for $14. Shipping is free with Prime.
This mask has a quick latch mechanism that makes it easy to drop down the respirator from face without removing head straps. This is an advantage over the 7500 series. Here is a link to the 3M selection guide for respirators: http://multimedia.3m.c
https://www.amazon.com/dp/B00IF7R…fCb3J
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