I checked out Trash for Teaching, a warehouse of mostly post-industrial stuff that can easily become supplies for art projects, models and dioramas, displays, crafting… you get the idea. The image above shows four of the bins. The image below, about half of the bins. There are a lot of bins.
I got a materials membership, so I’ll be back a lot… stay tuned. If you want to come with me sometime, they’re open on Wednesdays in the daytime, and one Saturday a month.