available vs off-the-shelf

available

adj
  • Readily obtainable. 

  • Valid. 

  • Free to meet someone, speak on the telephone, enter a romantic relationship, or the like. 

  • Such as one may avail oneself of; capable of being used for the accomplishment of a purpose. 

off-the-shelf

adj
  • As purchased or as commonly available, without modification or customization. 

How often have the words available and off-the-shelf occurred in a corpus of books? (source: Google Ngram Viewer )