When it comes to used goods, the Japanese aren't much for reselling. When they want to get rid of something, it usually ends up in the trash or recycling bin. There are no yards or garages for yard sales and garage sales. Some great stuff does end up at the growing number of Japanese flea markets, though.
Japanese call them "free" markets (no, really, it's not a joke), and similar to ones in the US, they can have any arrangement of commercial and residential sellers. Some markets require all sellers to have used goods or be residential. A couple markets can have as many as 800 sellers, but most of the (semi-) regular ones have a few dozen or a couple hundred dealers.
These items are mainly from a market held in Sendagaya near the Swallows' stadium.
I've got the itch to go to another flea market. For just a couple thousand yen, I walked off with a massive haul of great souvenirs and memorabilia. Usually there's a flea market being held somewhere on any given weekend, but finding them can be quite difficult. As time and money allows, I'll continue exploring, searching for more. But, of course, they're usually erratically scheduled so making continued plans is tough!