dollar store vs variety store

dollar store

noun
  • A retail store selling inexpensive items, especially one in which all items have a price of one dollar. 

  • A government-owned shop in Cuba that sold goods mainly to foreigners and solely in exchange for hard currency. 

variety store

noun
  • A shop where many small and inexpensive items can be bought. 

How often have the words dollar store and variety store occurred in a corpus of books? (source: Google Ngram Viewer )