How rare is a 1979 Susan B. Anthony?

I'm curious, could you please shed some light on the rarity of a 1979 Susan B. Anthony coin? Are they particularly hard to come by or do they still have a fairly high circulation in the market? Is there a specific mint mark or condition that makes some 1979 Susan B. Anthony coins more valuable than others? And, for collectors out there, how does the rarity of this coin factor into its overall desirability and potential value? I'd appreciate any insights you could provide on this matter.