I know bison bushcraft have them on their website but say they are out of stock... it might be worth asking when they expect stock in.
For me, 10cm would only be useful for a cuppa so I would just use my crusader mug for cooking and then drinking out of...
I have a 12cm one that's ok for wayfayrer meals one at a time. the 16cm is about the best I have used for proper cooking.