Cheap, easy, and sustainable.
Every so often, I go through the crayons and collect all the small and broken pieces. These get saved until we have a nice amount.
I save my kid’s clothes and try to use them as hand me downs as much as possible.
Speaking of clothes lasting- I try as much as possible not to use a dryer. I hang all my clothes. This reduces the number of dryer loads I have to do (save on electricity), and the clothes last much longer when hung to dry rather than put in the dryer.