Where can you find Albino Doberman Pinscher puppies for sale?

Not from any good breeder. Any good breeder won't even use a Z factored dog in their bloodlines. Albino dogs are a genetic mess... A walking vet bill. You don't want one.

You really need to educate yourself about this, and here's a start:
http://dpca.org/albino/albino_about.php

Nowhere. This is just an extremely rare mutation that no one can "breed" for.

Why on earth would you want an albino dog? Without pigmentation it would be EXTREMELY sensitive to sunlight.

Hopefully NOWHERE.

nowhere reputable

Only from someone incredibly irresponsible. No one with any care for the animal would produce, sell, or purchase such a puppy. The trait, in Dobermans, is strongly correlated with severe hearing and vision impairment, an unstable temperament, and serious skin disorders, among other defects.

They are a freak of nature & very sickly. They are fairly rare. No reputable breeder would breed a dog that has the gene in its genetics. BYBers do not do any genetic testing, no Vet care, no selective breeding, so if one where to pop up some where I would have to be from poor breeding tactics as the BYBer.

Not recommended, they have skin and eyesight problems, making them more likely to be fear biters since they can't see very well.

There are 4 other standard colors for Dobermans. No real reason to seek out an albino one.
http://dobermansden.com/doberman-colors/

Eww, that sounds hideous.

Why would you want a dog with hearing & vision problems, with temperament issues? What a mess.