When you wanna buy something, perhaps you can’t understand the price.
It will be troubles.
Then you can use this words “kore ha ikura desuka” to ask the price.
It means “how much is this??”
Then the shop keepers will tell you the price.
Did you remember the word “sumimasen” that I explained before the topic??
If you can put the “sumimasen” top of the sentence, it will be more polite.
Please enjoy shopping in Japan.
Kore ＝ this ＝ これ
Ha ＝ is ＝は
Ikura ＝ how much ＝ いくら