I have looked into them as well and did not know they were tonak bodies but had heard issues with their quality.If you go on Etsy you’ll find Agnoulita sells Tonak felts bodies, cones, etc. he has them in suede/antelope, velour, longhair, standard, etc. The proprietor, Mr. P, speaks perfect English and is easy to work with, but be aware that he sometimes takes several days to answer his emails. All I’ve ever found are rabbit fur felts (and wool) so if you want beaver or hare or a blend I don’t know that he can help you.
This link will get you started:
https://www.etsy.com/listing/515316078/rabbit-fur-felt-hat-bodies-cappellines?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=rabbit fur felt&ref=sr_gallery-1-1&organic_search_click=1
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