Most hatcheries have them. Should not be difficult to find GSH or a similar species.
http://www.zettsfishhatchery.com/id53.html Found this hatchery for you. I don't know how close it is to you but they have "silver shiners". Those should work for you.
Reading through I found it quite funny that they recommend stocking BH in every pond but don't supply HBG because they aren't all they're cracked up to be.
Just a warning, don't listen to this website, listen to pond boss. After all, what hatchery has BH and GSF?
