Discount supermarket chain Aldi has sensationally sliced $200 from the retail price of one of the most expensive bottles of Scotch whisky that Australians can buy from liquor stores.

From Saturday, the German discount retailer will offer bottles of Johnnie Walker Blue Label King George V as an online-only special for $399, one-third cheaper than the next most affordable examples that Executive Style could find.

Aldi has slashed the price of Johnnie Walker's Blue Label King George V special edition.

Both Dan Murphy's, the big-box alcohol retailer that prides itself on having the market's lowest prices, and Nick's Wine Merchants offer the same 750ml bottle for $599, while the World of Whisky store in Sydney's Double Bay prices it at $980, or $890 for store members.