Flea Markets are meccas for problematic puppy sellers. Since the USDA is now regulating commercial breeders who sell puppies sight-unseen over the Internet, flea markets are one of the last unregulated marketplaces for questionable puppy sellers, many of them unlicensed and uninspected. As a result, there has been an increase in the number of operators selling puppies at flea markets across the country—likely in an effort to escape government regulation.
The Humane Society of the United States, "Fact Sheet on Puppy Mills and Flea Markets" (2013). PUPPY MILL REPORTS. 5.