Stoneware works very well for these. It's easy to heat the saki to just the right temperature using a microwave.
I was surprised to find the Japanese were doing this the first time I went there.
I have several saki sets collected here and there.
Wonderful ceramic saki barrels can be found at flea markets. I have two barrels similar to this one. One I bought in Japan, the other I found at a flea market in Tucson.
Many times huge barrels are lined up to make a wall of them at temple festivals.