The two here are built around doing rather than explaining. The mitzvah pomegranate uses bubble wrap to stand for the seeds, and children pop one for each good deed, which turns an abstract idea into something countable. The honey sensory bags let the youngest handle honey and apples without any of it reaching the floor.
The honey sensory bags. Honey and apple beads are sealed inside a double freezer bag and taped down, so a toddler gets the squish and the colour with nothing to clean up afterwards. It holds attention far longer than the setup time suggests.
Very little. Both activities use things that are already in the house or cost a few dollars — bubble wrap, a freezer bag, honey, beads. Prep is ten minutes the night before, which is the point: these exist for the week when there is no time left.