Viori Native Essence Fragrance-Free Shampoo Bar
$11.75
Best low-waste bargain: fragrance-free, essential-oil-free, sulfate-free, bottle-free.
A more processed surfactant-bar formula than Carina, but practical and low-waste.
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.