Where can I get puppies for my puppy store?

I am in the process of trying to open a pet store and DO NOT want to get my puppies from a puppy mill. Unfortunately, if I were to buy them one at a time from individual breeders, I would not be able to stay in business. Can anyone tell me where I can buy multiple puppies of various breeds that have been bred in humane conditions? Please do not respond just to tell me not to open a pet store. Thanks.