After looking for some Tamasaba goldfish the past couple of years, I decided to look for something else. I purchased these 2 Sabao goldfish today. They are the "cousin" to the Tamasaba. They will get a somewhat rounded butterball turkey look, and grow to around 10". They also have a nice wide single tail.
If you're not familiar with them, here's more info. Apparently they are not that common here in the U.S., can't wait to get them!
https://nextdaykoi.com/goldfish-facts/sabao-goldfish/