Haven't checked in for a while. Check out Uncle Henry's. There's a place in Leeds, and one in Guilford, that sells mallards. Their ads are in Animals-Pets & Accessories. (I guess they qualify as an accessory )
I usually get quail or chuckar every year. The bird people I deal with usually don't have ducks, but I have some phone numbers if you want them.
How many do you need? If you need just a few I can probably help you out. If you need a big supply let me know and I can give you a couple of numbers to call Where we get our ducks for training.You can e-mail me at firstname.lastname@example.org