買ってるの

do you buy

→ 買う
phrase Rare #35,342
do you buy A casual question form. 買ってる is a contraction of 買っている and can refer to a habit or an ongoing action; の softens or adds an explanatory tone to the question.
JA: いつもどこでコーヒーを買ってるの?
EN: Where do you usually buy coffee?

トムは普段どこで服を買ってるの?

Where does Tom usually buy his clothes?

服は普段どこで買ってるの?

Where do you usually buy your clothes?

彼女、本はどこで買ってるのかな?

I wonder where she buys her books.

まだ宝くじ買ってるの?

Are you still buying lottery tickets?