In Cuba between 1993 and 2004, a dollar store was a government-owned shop that sold goods solely in exchange for hard currency, originally mainly to foreigners, in the same way as a Friendship store in the People's Republic of China or an Intershop in the German Democratic Republic.
In 1993, Cuba made the United States dollar legal tender.
In November 2004, the US dollar ceased to be legal tender to use in cash commercial transactions and was replaced by the Cuban convertible peso. However, the "dollar stores" remained open and despite their acceptance of only the convertible peso, the term "dollar stores" remained in colloquial use.
References
Dollar store (Cuba) Wikipedia(Text) CC BY-SA