A retail store where most or all items are sold for 100 yen; a '100-yen shop' selling a wide range of affordable household goods.
毎週末は近所の１００円均一ショップで日用品を買う。
Every weekend I buy daily necessities at the nearby 100-yen shop.
その１００円均一ショップはほとんどの商品が税込100円だが、一部商品は150円だった。
At that 100-yen shop most items are 100 yen including tax, but some items were 150 yen.
引っ越しのときは箱や梱包用品を１００円均一ショップで揃えた。
When I moved, I got boxes and packing supplies at the 100-yen shop.