forthcoming vs on offer

forthcoming

noun
  • Something that is yet to come. 

  • An act of coming forth. 

adj
  • Available when needed; in place, ready. 

  • Willing to co-operate or provide information; candid, frank, responsive. 

  • Approaching or about to take place. 

on offer

prep
  • For sale at a reduced price. 

  • Available to take; at hand; being offered or to be offered. 

How often have the words forthcoming and on offer occurred in a corpus of books? (source: Google Ngram Viewer )