I can find plenty of gin in the supermarkets but no tonic. With this shortage of quinine, I predict an epidemic of malaria by summer's end. If anyone can send tonic water here, you would be supporting a worthy cause.
UPDATED July 13: Crisis averted. E-mart has Tonic Water in stock again. All is right with the world.
By the way, the wikipedia article suggests that quinine may be effective against prions - Mad Cow Disease is caused by a prion so Korean should take careful note.