I have also used the gym sock method. Clean ones of courseMy reply was in regards to a comment that said who was doing jogging/exercise with a mask on.
My N95s were bought off eBay well early on (early March) bought 20 for 40 dollars. I also bought locally some surgical masks at 25 pesos when they were still cheap. They all go through a cleaning process involving hydrogen peroxide, UV-C light, sun, and staying put for 5 days in a breathable paper bag or paper box.
There are still N95 masks being sold on eBay for about 5 dollars apiece, still cheaper than local price here.