米国版の百均の事でしたら
『one dollar store』や『one dollar shop』（[1ドル](https://eikaiwa.dmm.com/uknow/questions/84010/)ショップ）になりますが、
日本国内の百均の話しをされたい場合は
『hundred yen store』（100円ショップ）と言う風に言います。
ちなみに300円ショップの場合は
『three hundred yen shop』です。
ちなみに文字で表記される場合は
『100 yen shop』や『300 yen shop』と言う風に書くこともあります。
This type of store is called a Dollar store in the USA. You can call it a 100 yen shop or store in Japan.
Example sentences:
"I am stopping by the dollar store. Do you need anything?"
"We were surprised to see all the things we could buy at the dollar store."
"Can you buy milk at the 100 yen shop?"
"I will stop by the 100 yen shop on my way home."
このタイプのお店のことを、アメリカでは a Dollar storeと言います。日本では a 100 yen shop または storeと言うことができます。
例文：
"I am stopping by the dollar store. Do you need anything?"
百均に寄るわ。何かいる？
"We were surprised to see all the things we could buy at the dollar store."
百均で全て買うことができるたくさんのものに驚いた。
"Can you buy milk at the 100 yen shop?"
百均で牛乳を買ってきてもらえる？
"I will stop by the 100 yen shop on my way home."
帰る途中で、百均に寄るよ。
Although ¥100, £1 and $1 are not all worth the same, the concept of a shop where all products are one price exist in many countries. In the UK we call these shops 'pound shops'. In the USA they are called 'dollar stores'.
These kind of shops are a big factor in many poorer people being able to afford basic products for their home. For example, in the UK at a normal supermarket a tube of toothpaste might cost around £3, but at the 'pound shop' the toothpaste is only £1.
So why go to the normal supermarket?
In the UK we have an independent currency (not euros) so the shop would be called 'a pound shop'.
"I go to the pound shop regularly - everything's a bargain!'
イギリスでは、（ユーロではなく）独自の通貨を使っています。ですから、こうした店は、'a pound shop'（1ポンドショップ）と言えるでしょう。
例文
"I go to the pound shop regularly - everything's a bargain!'
（1ポンドショップによく行くよ。売っている物は全部格安だよ）
In America it is called the One Dollar store and they are well known, where everything is cheaper and you can find many items that cost one dollar. One dollar equals to 111 yen.
These stores sell a lot of products that range from clothes to culinary to accessories. Sometimes you might find this 1$ symbol on the window indicating it is a one dollar store.
Hope this helps!
アメリカでは、 One Dollar storeと呼ばれ、よく知られています。全てが安く、たくさんの商品を1ドルで見つけることができます。 1ドルは約111円です。
これらの店は、衣類から、台所用品、アクセサリーまで幅広いたくさんの商品を販売しています。時には、窓にこの1$のシンボルを見ることがあるかもしれません。これは one dollar store を表します。
In America we have many 1-dollar stores. In these stores everything costs 1 dollar, no exceptions. There are also other shops that are very cheap, but they are usually referred to as Discount Stores, the products are discounted and cheap, but not at a set price of 1 dollar, like the dollar stores. I imagine we can say the same about a 100-Yen shop. If every product is 100 Yen, no exceptions, then you can refer to it as the 100-Yen Shop or even the 100-Yen discount Store.
日本 
ドイツ 
アメリカ合衆国 
イギリス 
カナダ 
