Some places to sell teacup shih tzu puppies include PuppyFind.com and Oodle. Oodle has a pet section where people post their pets for adoption, including shih tzus.
To post on Oodle, go to the Dogs section of the site and click on Post. Fill out the information, including details about the appearance and behavior of the shih tzu puppy. Include any pertinent details, such as how well it gets along with other dogs or small children. Post pictures and a price for the puppy.
At PuppyFind.com, sell the puppy by first clicking on List a Puppy. Create a free account first before posting an ad for the puppy. Log in after receiving the confirmation email, then add the new listing. Complete the form, providing accurate contact details.