attainable vs on offer

attainable

noun
  • Something that can be attained. 

adj
  • Able to be accomplished, achieved, or obtained. 

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 attainable and on offer occurred in a corpus of books? (source: Google Ngram Viewer )