Rumpless Araucana will breed true. The rumpless gene is a dominant one. Tailed birds do occasionally pop up, due to it being a recessive, but it isn't normal.
http://www.araucana.net/
The site has both a breeder list and a classifieds section.
Ameraucana are not rumpless. It's the Araucana that should be rumpless. Many people confuse the two breeds or use the names interchangeably. Please note that Ameraucana and Araucana are two very different breeds. They are not the same things.
Both true Ameraucana and Araucana lay only blue eggs. MyPetChicken, Meyer, and Cackle offer true Ameraucana, or you could go the one of the breed club web pages and find a breeder.