I'm not aware of any hatcheries in the U.S. that carry either species, and I used to have a list of all hatcheries and what species they carry in a publication called
The Aquaculture's Buyer's Guide. Not sure if the magazine or publication is even in existence anymore.
The only way you would probably get your hands on alewives is to remove some from Lake Michigan (and Indiana waters only) as any fish moved from another Great Lakes state requires VHS testing, but they are:
1.) Not on the list of approved species (therefore a permit would be needed if it would be granted at all.
http://www.in.gov/dnr/fishwild/files/FishImportationRegulations.pdf2.) Moving fish or water from any of the any Great Lakes is seriously dangerous now as you could introduce VHS, not to mention zebra mussel veligers
3.) Don't know if they reproduce sufficiently or at all in a pond, and
4.) They are very sensitive to drastic temp drops which is more likely in ponds vs. larger bodies of water. Even in Lake Michigan there are die offs due to drastic temperature drops.
Bluebacks are only found on the east coast.
The Great Lakes now have at last count 8 exotic parasites including the Asian tapeworm. I wouldn't want to bring any fish from those lakes into my ponds even if you paid me.