For me, it was a pair of merrell shoes on sale. They have lasted 3+ years, have great grip in the snow and ice, and so comfortable, my feet don’t hurt after wearing all day.
Never cheap out on anything that comes between you and the ground; shoes, tires, a bed.
What have been some of your good purchases under $100?
Weighted blankets are the best, definitely recommend them. They’ve gotten much cheaper in the last 5 years, too. Down from like $150 to more like $40