bargain basement vs big box

bargain basement

noun
  • An area within a retail store, especially an area located below ground level, where the least costly merchandise can be found. 

  • Inexpensive. 

  • Of poor quality; of little or no value; low-end, shoddy. 

big box

noun
  • A large self-service store, usually on a single level, with few interior walls, owned and run by a corporation 

How often have the words bargain basement and big box occurred in a corpus of books? (source: Google Ngram Viewer )