It's probably those Dutch Hookbills. They are cute ducks, too, and rather unique looking.
About $8.50 each plus shipping, 10 minimum. Probably end up somewhere close to $10 per duckling. Order from Holderread. Spend the extra $2 to get the show potential ones.
If you want small, then probably it would be the Silkies. They need special care, though, because they aren't as well insulated from the weather.