Zoro still has them in stock. If you haven't heard of them, they are a subsidiary of Grainger, a huge industrial supply company. They seem to ship even faster t

Zoro still has them in stock. If you haven't heard of them, they are a subsidiary of Grainger, a huge industrial supply company. They seem to ship even faster than Amazon in my experience. https://www.zoro.com/3m-full-facepiece-reusable-respirator-with-cool-flow-valve-6000-series-size-medium-6800/i/G2038163/?variantSelection=Mask+Size https://www.zoro.com/3m-full-facepiece-reusable-respirator-w...