You can get Tylosin at pigeon supply places, here is one:
https://pigeonsuppliesplus.com/products/tylosin-99-100-grams-pdr-pigeon-supplies-plus-line?variant=19069683973¤cy=USD&gclid=CjwKCAjw36DpBRAYEiwAmVVDMIHMhw8XUpY0gLl-oGO_O-cWVCJoZp3iq5Bdu44tZAhk7SB_zAyiYRoCcoUQAvD_BwE