You might consider finding out which models use the same impeller and then look for a whole used functioning unit for the same price as that shipped impeller. Or call and ask each independent lfs
if they have any for sale. Impellers. (though some stores sell used stuff too from trade ins) Sometimes they will buy stuff in bulk and have some spare stuff lying around. If they quote a "retail" price, politely ask if they would take a couple bucks less.