PRIMALS Boar Bristle & Bamboo Toothbrush
$38 / 4-pack
Good budget or niche option: bamboo handle, natural boar bristles, no nylon or plastic bristle contact.
A newer, smaller brand with less third-party validation.
A US source in the The Unmasked Face directory. Check that it ships to Europe; where it does not, the directory lists a European alternative alongside it.