showroom vs trading post

showroom

noun
  • A room in a business set aside for the display of the company's products. 

verb
  • To inspect merchandise in a physical store, then purchase the identical product from an online merchant; to use a physical store as a showroom for an online merchant. 

trading post

noun
  • A place where trading of goods takes place. 

How often have the words showroom and trading post occurred in a corpus of books? (source: Google Ngram Viewer )