I'm sorry you need to rehome your ducks.
You might try our state thread:
https://www.backyardchickens.com/th...me-together-washington-peeps.717207/page-5036
Also the app Nextdoor.
Sometimes Craigslist can be successful. I got 3 pet ducks there, the person who gave them to me had requirements and did 2 home visits before letting me have them. I'm very dedicated to them and take them to the vet, so it can work out well if you investigate the home.
Also, you may want to look into flock ratios. Usually we recommend about 5 female ducks for every 1 male duck to prevent injuries from overmating. Female ducks can be permanently injured or killed from overmating. Your ducks' new owner may not know this, or have space for more ducks/coops ect.