Castle Lager for sale from the top online bottle store in SA. Buy Beer from our online liquor store. Free alcohol delivery today. Castle Lager is a 100% homegrown beer, loved by generations of South Africans. Its history goes back to the 1860s when brewer Charles Glass followed hopeful prospectors to Johannesburg. Instead of mining for gold, he produced a national treasure: a beer that struck a perfect balance between dry and bitter. The spirit of friendship that Castle Lager was built on is still going strong. Its a proudly South African brand thats all about bringing people together.