Unused pillow/cushion exchange

Is it possible to have some kind of exchange for unused nasal pillows, nasal cushions, FF mask cushions, etc. I know I have quite a collection of sizes from all my masks that I will never use. Many masks come with numerous cushions that a person will never use. I have more small and mediums that are going to waste. It would be much more useful to trade them with someone who has larges they will never use. Just an idea.