We go to Saprona all the time and the chef, Randy, is very good preparing GF options. They also have Tamari. When you order, make sure you to tell the wait staff that you want to order GF.
I've been to this sushi restaurant many times and really like their awareness about GF options. Great fresh sushi and thai food as well. The sushi chef will even make GF eel sauce upon request. And they always have tamari available!