What about the bargain assortment from Holderreads? You can get some Holderread quality birds for $9 a gosling which is about what I pay for hatchery quality birds down here.
That's a good idea. I have also ordered ducks from Metzer's as was very happy with them. They're pets, though, not SQ. All four ducklings arrived healthy and still are 3 years later.
Personally, I would prefer to buy local if I can, but that's not always possible.