Yep! Do you have any pics of the pen? And what are the dimensions?
Yeah, ringnecks are kinda nutty. They are really not good pets. I raised a pair once and...

CRAZY birds.
Well...hatching eggs are not a good idea. Getting the ducklings/adults themselves is the best route. Hatching eggs are not guaranteed to hatch, do not handle shipping well, and are very dufficult to actually hatch. And then you have to take care of the babies. They are tough to get to eat sometimes too.
Getting ducklings would be the best option, imo. You are in Washington I see. Are you willing to travel at all?
I got some of my birds from a guy in MN.
@The Phantom in Wisconsin knows a lot of breeders of exotic fowl, and she breeds a lot herself. Maybe she can help you find some birds. I don't have many contacts yet, so I can't help much with breeders.
What kind of info are you looking for?
Mandarin ducks and Ringed teal are probably some of the cheapest waterfowl you can get.