In the common room there is a space for people to leave unwanted items up for adoption. This system works really well. On Castle Mill People, there is space for advertising your unwanted bits and pieces. Maybe you are moving on, or just having a clear out. If you need to get rid of something, advertise it here. If you would like to sell something, advertise it here too.
Or, perhaps there is something you really need. You can always ask for things here too.