Your best bet for a commercial hatchery would be to order from mypetchicken.com as they are one of the best options when it comes to wanting a small order/less restriction on birds per breed. Alternatively, it may be even better to find yourself a good, local source. Where are you located and which bantam breeds are you looking for? Another consideration with bantams is the issue of obtaining sexed birds - for the most part, bantams are sold straight run only -- with your desire to have a flock of one each of many breeds you are limiting your chances of lucking out on gender (vs ordering 3-5 of each and then selling off any "extras", cockerels, etc) if you order day-old chicks. Purchasing started birds that have reached the age of gender certainty might be a better option for you.