This is an amazing thing your doing... And defiantly something I've considered myself to do when I have a lot more free time on my hands.
I don't think you should give up now after everything ... But that being said I guess it is a rarity to find someone advertising a disabled bird as Kirsten said it's thought to be undesired by many .
Have you got anywhere you could advertise for one under a wanted ad? We have In the UK preloved.com and gumtree.com I'm sure if someone saw you advertising for one then you may have better luck?