Some see visiting the vet for vaccinating and microchipping a litter as too 'expensive'.
In which case it's a very good possibility they are puppy farmers/backyard breeders, only interested/concerned about the profit margin. Any legitimate registered breeder should sell pups vaccinated and most definitely microchipped, health checked etc. breeders that breed because they love their chosen breed and have a desire to improve the genetics of the breed/breed to breed standard would not hesitate at providing an exceptional level of veterinary care, and sell their puppies vaccinated to help give them the best start to a happy & healthy and life