WTD: Cheap 36h 12×142 rear hub or 20″ wheel

Desperately trying to finish a build for a friend’s daughter to spread the love of bikes! Final piece of the puzzle I need is a 12×142 36h to rebuild a donor wheel on to, or alternatively a 20″ 12×142(!) full wheel. Yeah, I know, it’s an odd one…

Needs to be disc, HG freehub.

Cheap as possible please, nothing fancy required!