True SuperDwarf retics are the only true dwarfs IMO. Jampea's have reached 15ft, kayaudi's have reached 10-12ft. Selayer Golden Dwarfs typically reach around 10ft, there is one pic I've seen of a 15fter. I have a first Generation C.B.B. Selayer (first in the US) produced by Greg over at The Retic Ranch so time will tell on the size of the Selayers. My girl has just about trippled in size since I got her. She was born Easter day. I am also feeding her like crazy though. Her siblings are much smaller. If you take it easy on feeding I'm sure any of the "dwarfs" will stay pretty small.
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Just scroll through, plenty of dwarf retics for sale.