я куплю вам

I'll buy you

→ я
phrase Rare #36,183
I'll buy you A common offer or promise meaning “I’ll buy you something.” Вам is the dative form meaning “to you” or “for you,” used for one person formally or for multiple people.
RU: Я куплю вам кофе.
EN: I'll buy you a coffee.

Я куплю вам другую, если хотите.

I'll buy you another one if you want.

Давай я куплю вам билеты.

Let me buy the tickets for you.

— Судзумэ, закрывающая двери (2022)

Я куплю вам новый.

I'll buy you a new one.

Давайте я куплю вам пива.

Let me buy you a beer.