Teacup persians already exist ! They weigh 3 or 4 pounds once full-grown. I am getting one next summer It will be funny to see this 3.5 pound fluffy kitty with my HUGE Ragdoll I will call my small persian "Minhibou". (Mini + hibou (owl in french, because persians look like owls to me) = Minhibou ).

There are 4 teacup persians breeders in the United-States for the moment. here's one of the catteries' website (absolutely wonderful website, by the way !! :
http://www.nemr.net/~poppy1//teacup.htm --> Cozy Kittens Cattery's micro-kitties are sold $2000, and the waiting list is filled to the very brim !

My teacup persian will come from "Chatterie Emeraude", not too far from my city, in Québec. Their price is more friendly : $500...