The small Siamese and Black Flap Cats were normal production pieces available in stores. They came out in 1988/89 and retired in 2001/02.
The Birmans flap cats currently in the Windstone store have white points and little color on their wings. It helps to keep from confusing them with the older, retired Siamese. I’m not sure if these are limited production or available from retailors or not.
There were also several Limited Editions that Windstone sold on ebay: White Bird Winged Flap Cat, Spotted Bat Winged Flap Cat, Small Grey Tabby Flap Cat, Spotted Bird Winged Flap Cat and Special Birman Bird & Bat Winged Flap Cat.