Under $100: A second hand piano for $80. Learning an instrument is a deeply satisfying experience if you stick to it (as well as frustrated and confusing). Literally no end to how much you can learn. It has given me hours of “in the zone” moments, so well needed in a stressful world. I also see (hear?) music in a different light and can understand it better. Under $100:1) A bidet! Got one in the pandemic when toilet paper was scarce and I wanted to be more efficient, but now I'll never go back. ...