It's a low cost option and takes patience.
The adult (print & assemble) forms have been available for a while in the eshop at PatternSchool Online
https://www.patternschool.online/body-formsCurrently Stuart Anderson has been working on developing a collection of these body forms for child shapes in various sizes.
Expected to be available soon to buy from the online shop.
If you can tolerate the the download, print cut and assemble process, maybe trying these DIY bodyforms may be an option for some.
Just a note - the Patternschool patterns, blocks and information are generally aimed toward industry, production drafting and design work rather than custom/bespoke applications. If you want to try them for custom work, then like any block, template or pattern, expect to alter, adjust, test etc .
Also I realise that some consider Stuart Anderson as somewhat a Marmite kind of figure. Even so, the ideas, 'discussion', perspectives and information can be helpful, interesting, etc. for the just curious, enthusiasts, small production units, costume makers dressmakers, hobbyists etc.
If you're interested in the child body forms, you can catch up with the progress on the FB group (it's set to private so you'll need to join but can leave easily if it's not for you)
https://m.facebook.com/patternschoolonline/