YOU SAID:

I would like to buy a banana, but only for the price of an orange, unless apples are cheaper.

INTO JAPANESE

バナナを買いたいのですが、りんごが安い場合を除いて、オレンジの値段でしか買えません。

BACK INTO ENGLISH

I would like to buy a banana, but unless the apple is cheap, I can only buy it at the price of an orange.

INTO JAPANESE

バナナを買いたいのですが、りんごが安くないとオレンジの値段でしか買えません。

BACK INTO ENGLISH

I want to buy bananas, but if apples aren't cheap, I can only buy them at the price of oranges.

INTO JAPANESE

バナナを買いたいのですが、りんごが安くなければオレンジの値段でしか買えません。

BACK INTO ENGLISH

I want to buy bananas, but if apples aren't cheap, I can only buy them at the price of oranges.