It is difficult to find N95 inserts, so I order a box of 35 pieces of Halyard Fluidshield 3 N95 Particulate Filter Respirator and Surgical Mask with So Soft Lining from http://www.wellbefore.com. Then I cut them down to fit inside a cloth mask with a pocket insert. You can cut 2 pieces from one of these masks to act as an insert.
Their phone number is (214) 416-9009. They are located in Dallas, and I've ordered from them since the beginning of the pandemic.
If you email me at phamshari@yahoo.com, I can send you a photo of the box and mask.....I'm not good at uploading a photo to the computer.
I also have PM2.5 inserts that I use when I walk my dog, to keep dust and pollution at bay. I order these from Amazon.