BOGOF ,
bog‧of /ˈbɒɡɒf $ ˈbɑːɡɒːf, ˈbɒːɡ-/
noun [uncountable and countable] (buy one get one free) an offer from a shop to sell you two things of the same type for the price of one:
Take advantage of special offers and BOGOFs in supermarkets. [TahlilGaran] Dictionary of Contemporary English ▲