How do you buy duck?

How does one go about purchasing ducks, if you don't mind me asking? I've heard that they can be quite a delightful addition to a backyard farm or even as pets. But I'm not sure where to start or what steps I should take to ensure a smooth and successful transaction. Could you please elaborate on the process of buying ducks, including any tips or considerations that I should keep in mind? I'd greatly appreciate your insight on this matter.