Makes sense... those are production inputs, not consumer outputs, and thus most of the people who need those things would probably need them in bulk. The number of hobbyist producers is probably too small to make it worthwhile to keep small batches in stock. You'll need to find a specialty retailer of some kind who carries those things for hobbyists, kinda like how I'd use Adafruit to look for small batch specialty electronics that I can't find on Amazon