It is sometimes hard to know exactly what size fish you need to buy.

"Say he needs to buy something, during the course of the day?"

Next, if they followed your idea, then 100 million people would need to buy a new phone.

Do you need to buy individual card for the whole family?

You'll need to buy new ones at least once a year.

Perhaps that's because you'd need to buy it with the heart rather than the head.

If I only need to buy one, is this it?

You really don't need to buy everything in one go.

What size clothes do we need to buy for you?

You may need to buy some and put them in yourself.