Hi Matthew, 

We try to stay as close to the English as possible -

In this case -

you will need to find 

and not

you are going to need to find

which is quite wordy for a conversation within a shop.

Bonne Continuation !

Hi Kalpana, 

What you suggest sounds more like 'you have to find' rather than 'you will need to find' but a beautiful expression using a lovely subjunctive nonetheless.

Bonne Continuation !