There are many places, such as: -Local chicken keepers, farms, and farmers markets -Fairs and bird shows -Classifieds -Websites such as Craigslist, My Pet Chicken, Eggbid, and BackyardChickens Forum
Murry McMurray Hatchery has a large selection of bantam hens. You can order them in straight runs or by sex. I think the minimum order is 25. I'm sure there are other hatchery's on-line if you search...