There aren't too many Bantam duck breeds to choose from.
Calls(of course), Buffs, Black(and Blue) East Indies and I know there are a couple more, but can't think of them right off.
Are you looking for pet quality? Metzers is a good source and so is Holderreads for PQ ducks.
I think Holerreads is in your neck of the woods(California, right?).
They're in Oregon, I believe. They have some nice pet quality ducks. Go check out their website and see what they offer. http://www.holderreadfarm.com/