Basically the answer is nowhere. I have found after talking with people who are enquiring about purchasing a mini, toy, pocket, teacup, or miniature Pomeranians, these people are actually asking to purchase the correct show size Pomeranian.
Always purchase your Pomeranian from a reputable, registered SHOW breeder. A Show breeder breeds Pomeranians conforming closely to the Pomeranian breed standard, so you can expect a puppy purchased from these sources to mature at between 3 and 7 lbs.
The present Pom standard states the breed should be within the following weight
Size-Dogs 1.8. kg to 2 kg. Bitches 2kg. to 2.5. kg.
The U.S. Pomeranian Breed Standard is between 3 and 7 lb in weight for a mature Pomeranian.
This is a very small dog. Pomeranian Puppies are usually between 2 and 5 oz at birth
Adult Pomeranians can range in height from about Height: 8 – 11″ (20.3 – 27.9cm).
The Pom breed standard deviates from most others by requiring the female to be slightly larger than the male.
No dog breed, such as miniature, toy or teacup Pomeranians exist….just POMERANIANS.
The very first Pomeranian breed standard is dated 1898. This early standard makes no mention of size and it is not until the 1950 breed standard that we find a reference to the desired weight range for the Pomeranian breed “ 4 to 4.5. lbs for males and 4.5. lbs to 5.5 lbs for females “.
There is no mention in either the 1909 or 1925 Breed Standards of any desired weight or height for the Pomeranian.
At the formation of English Pomeranian Club the breed was divided by weight into two sections : one section for Pomeranians under 8 lbs and the other section for Pomeranians over 8lbs.
Four challenge certificates were granted by the Kennel Club, one for each sex in either weight. In 1908 the Challenge Certificates where reduced to two, but after requests to the kennel Club the number of Challenge Certificates for Pomeranians was again reinstated to Four Challenge Certificates. In 1915 the Kennel Club withdrew the Challenge Certificates for the over 8lb Pomeranians. After 1915. the Pomeranian should weigh under 7lb at maturity.
Prospective Pomeranian owners are often confused by advertising when buying a Pomeranian.
The correct sized Pomeranians do not have big litters. 1 to 3 Pomeranian babies in a Pomeranian litter is a the norm for a Pedigreed, Registered, Show Pomeranian .
After 40 years of experience breeding Champion Show Pomeranians, I will state that 3 to 4 Pomeranian puppies in a litter from a pedigreed, registered show Pomeranian is a large litter.
These tiny little Pomeranian dogs are not an economic viable breed for the Puppy Mills/farms and backyard Breeders. Most “Pomeranians” sourced from these type of outlets seem to be something completely different to the show Pomeranian. The puppies when very young still look cute to the uneducated eye, but as they mature these “Pomeranians” get bigger and bigger, long nosed, long backed, long legs, big eared, lack head and leg coat and very often have low tail sets.
Beware of any “breeder” advertising Pomeranians puppies by any of these terms.teacup pomeranian puppy. You can be sure that anyone who tells you they have teacup Pomeranians, miniature Pomeranians, or Toy Pomeranians for sale is not a reputable Breeder. My advice is to always purchase from a reputable breeder, so my advice to you is to avoid any “breeder” advertising or mentioning their puppies by these terms . I would look for your new family member elsewhere.
A Pomeranian dog which is recognized as show quality should be in the weight range 3 to 7 lbs. There is very good reason to have the minimum weight of 3 lbs. There are often problems with very small animals. Among the most common to appear are associated with health and vulnerability to ailments that larger animals of that breed often take in their stride. There is usually an underlying health problem that restricts a very small puppy’s growth. Most often this health problem will be of a very serious nature.
Breeding very small Pomeranians is often fraught with problems . Natural whelping is often impossible and veterinary intervention may be required, with the resultant vet bills. The smallest puppies in a litter often will have problems feeding naturally from their mother. The larger, stronger puppies will push the smaller sibling of the teat. Human intervention, by way of tube feeding if the puppy is very weak or bottle feeding for a slightly stronger puppy, is required if this puppy is to survive. In most animals the small members of the litters are called “runts”. The runts are not looked at as having any breeding potential and are certainly not used in any breeding program, nor are they built up as something to be sought after. The percentage of “runts” are generally kept to a minimum in any good breeding program.
Very small Pomeranians are far more fragile than the normal sized Pomeranians. Often requiring a lot of special care during their lifetime. Very tiny Poms are not suitable in households with young children. A small Pom can be easily killed or suffer serious injuries by being dropped by a young child.
When purchasing a Pomeranian as a family companion or pet it is always important to select the healthiest puppy available. A shortened life span on much loved family pet will have greatly affect all family members. If you are still determined to have a very small Pomeranian ( less than 4lb as an adult ). Go to extreme lengths to ensure that you purchase a healthy and active Pomeranian puppy. I would avoid having a small Pomeranian puppy shipped, so make arrangements to see the puppy in the fur prior to purchase. Ask about the puppy’s age. Pomeranian puppies should not leave there mother and siblings until at least 8 weeks of age. A very small Pomeranian puppy should not be leaving the breeder until at least 10 to 12 weeks of age.
Good luck with your Pomeranian puppy.
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References and Further Reading
 Denise Leo “The Pomeranian Handbook”.
 Kimbering Pomeranians “1891-1991”.