A shame, really...!
Especially since you sound so eager to have ducks!
That's great that you are interested in helping the breed :
Elizabeth ducks are so rare that even knowing about them is actually unusual...
In any case,
whatever you choose to eventually do : good luck with your project!
► Just so you know,
there is another breed - that is CRITICALLY endangered - that you might like too : Watervale ducks!
I don't know where you live, but since you know where to find Elizabeth ducks, I'm going to assume there is a 50% chance you could
also find Watervale ducks...?
(Look at them : they are incredibly beautiful ducks!)