I have heard people talk about scrounging parts for builds but not about networking off sight. I expect most members are like me, if I have acquired something for possible future use but you need one now I would give it to you, which is not practical for most members because of distance. However I frequently actively source materials from other dyi/sort of hoarders who are local and vice versa. Today a friend brought me four plastic storage barrels that he scored for free after I mentioned barrels specifically to him 3 months or more ago. Most people have too much stuff but don’t want to throw it away and are ecstatic when they find a home for it. I also go out of my way to acquire something with another person in mind to build up a bit of goodwill credit or pay back an exiting favour, not that we ever keep close track. A very long way to say plan ahead and ask around, what you need may be looking for a new home.