You have to buy it at the store and make it yourself. No restaurants serve it.
Its probably an acquired tasted, but, then, so is whiskey or sushi or jazz.
I started drinking it when I first came, in 2007, and have been drinking it every day for over ten years.
In the US, I buy it from Amazon.
Its a nice gentle caffeine hit, settles my stomach, and is a pleasant ritual.
Many people hate it. Many people like it.
These days there are all kinds of interesting organic small producer varieties in Argentina, with as wide a variety of tastes as teas.
Me, I happen to like bitter things, and fermented things- kombucha, amargos, kim chee, geuze.
Your mileage may vary.