Not cheap, but sooo worth it to me. Last time I bought it was R30 a bottle. Like around the 340ml, but in weird Yank sizes. Spar and other places sel a Frankies Root Beer brand, not nearly as nice, but still okay. The Frankie's Dandelion and Burdock is also great.
I'm a big fan of the frankies root beer! It seems to be really popular because most of the time I look for it there's only cinnamon cola, cream soda and the lemonade left. Been thinking about getting a soda stream and trying a DIY.