Selfridges, the only UK stockist, has sold its entire stock of several hundred bars within 48 hours and has ordered more supplies for its four outlets, to be sold in time for the Christmas period.
The manufacturer, Chicago-based Vosges Haut-Chocolat encourages first-time buyers to "engage your five senses ... let the lust of salt and sweet coat your tongue".
"Bacon and chocolate sounds like a strange combination, but the execution is fantastic. It's a real explosion of flavours and people love it," the Telegraph quoted Ewan Venters, food and restaurant director at Selfridges, as telling the Daily Mail.
"Some of the combinations were really surprising like putting curry in chocolate but it works.
"There has been a real revolution in luxury chocolate, as there was with wine a few years ago. People are much more knowledgeable about it and there is a growing demand for these high quality, exotic products instead of a box of Milk Tray," he added.