Rice Ball

Kotatsu is a heater that is installed under a table top; the table’s covered with a blanket, and the system heats your feet. With the coming climate crisis and total social collapse, keeping your toes warm won’t be a priority, but after the collapse, you may want to have one of these, low-energy heating systems.

This site doesn’t have ecommerce, but it has lists of businesses that sell specific products, mostly everyday Japanese items that are hard to find.