Like a dollar general store in USA?

Dollar General stores are generally set up in abandoned storefronts that are maintained very badly, managed by incompotent people, and employ generally the lowest class of people who seem not to shower. Ever. They also carry merchandise that other stores couldn't sell (for example, nameplates and customized name pens that say "Bort" or "Wilhelm") and nobody wants at any price. They have good candy bars though.

How do the 100 yen stores compare? I already know there are no supermarkets etc... and that it's often hard to find shops that are managed well with much stuff at very good prices.