One of the things this pandemic did to me and others is deny me access to Dallas Maker Space and killed/damaged a lot of my vendors for specific items. Enclosures in specific took a major hit. I could always 3D print a box or get one at Tanner's Electronics or Fry's Electronics (both went under and are gone now). My project (while not disposable) is something I don't think is major enough to spend any more money than I had to, I have started weaning myself from batteries where I can. So I salvaged a AAA batter box from a small flashlight I had destroyed modifying it to use a USB power cube. The only parts I spent money on were 3 resistors and a push button switch (total cost, well under $5). I have lots of cardboard from cereal boxes, etc so I made a project instead. I can test 1½V batteries w/ ½A. After checking a pile of batteries I now throw it into a storage box (don't need it anymore)...