I used to drink Rootbeer when it was sold in MCd's, as others have said here, when they stopped so did I for a fair while. It is an acquired taste I must admit.
I don't go looking for said drink in the supermarkets or shops or online, If its on a drinks menu when I'm out for a meal somewhere I'll order some, last time was on a trip back from north yorkshire in a roadside USA themed restaurant on the A1, called OK diner.