at a premium vs plentiful

at a premium

prep
  • At a high, or higher than expected, price. 

  • Scarce, in short supply. 

  • Above par value. 

plentiful

adj
  • Existing in large number or ample amount. 

  • Yielding abundance; fruitful. 

How often have the words at a premium and plentiful occurred in a corpus of books? (source: Google Ngram Viewer )