Treat (someone or oneself) to (something) verb phrase
To offer and pay for something as a present or as pleasure for someone.
After the university entrance exam, I decided to treat myself to a trip to Paris.
Let's eat out. I will treat you to lunch.
On the occasion of her birthday, she treated her friends to a round of drinks.
To pay the bill for something
Be interested in buying something
Something offers better value for your money.
To make a payment for something.