I think it's unfair for you to say that you shouldn't buy animals from pet shops as not all of them buy from Rodent farms.
I work in a small pet shop where all of the animals for sale are either bred by myself, the manager of the store or local breeders.
The shop is very strict with the requirements for animals, all of the cages are the correct sizes and comply with RSPCA guidelines for keeping animals, For example, there are 5 baby Syrian hamsters for sale, each in their own cage with plenty of room to run about and plenty of bedding and toys, compared to bigger shops such as P@H that often keeps 3 or 4 syrians in one container.
The manager of the store ensures that animals are sold in pairs if they need to be and that the customer knows exactly how to look after their new pet.