if youre struggling why not consider a trip to chelford market (not far from knutsford), we got the ducks there and we had to basically 'order' them off a guy as he mainly dealt in chickens. he's there every week and comes up from the south.
its on every monday, i'd suggest getting there between 9 and 10 to see lots of birds, as its a market your meant to register as a bidder to buy, which we didnt know, but, he did us the deal just outside the market after he'd packed up for the day.
i'd imagine if you asked nicely they'd sort you out with more or less whatever you want, there's a farm supplies shop just back on the main chelford road too on the way out, if this info's any good to you, the telephone number for chelford market is 01625 861 122