Oh wait I can just give you my links (I saw your first post are made in french) Grit- https://www.amazon.fr/dp/B003ZGBXNY Powder (BIG pack)- https://www.amazon.fr/VERSELE-LAGA-Colombine-vitamines-min%C3%A9raux-Oligo-%C3%A9l%C3%A9ments/dp/B075L49863 Calcium: - https://www.amazon.fr/dp/B0FKGHSKM3 Other websites where you can sometimes find good stuff:- https://www.oiseaux-mania.com/ (careful on one thing, they sell essential oil for "health" it's NOT good)- https://www.animal-valley.com/
