This is what my neighbor has. Not sure about the China 9. Sounds too Covid 19 for me.

Satsuma Mandarin Plants (hardy):Toby Parker of Turbeville, SC admires another bumper crop of satsumas at his residence. Toby actually ships fruit to friends in Arkansas every year! Other types of satsumas available are miyagawa, dobashi beni, okitsu, Mr Mac,and a new release from China called China 9.

Price is 20 dollars per 1 gallon tree