It's still traded on CME. It's rough rice futures. https://www.cmegroup.com/markets/agriculture/grains/rough-rice.html
OP already said cbot rice is dead.
I trade the rough rice futures on the CME Globex (ZR).
https://www.cmegroup.com/markets/agriculture/grains/rough-rice.html
Volume is hundreds of contracts per day. Spreads are relatively narrow. I'm currently seeing a spread of 0.005 but it's not normally that narrow. My average spread is 0.0084.
looking at the news and everything - seems its time to learn chinese