You can get amprolium (Corid, Amprol or AmproMed) at most feed stores. It's usually found in the cattle section. Liquid or powder, either can be used.
Baytril (enrofloxacin) you have to buy online or from a vet. Google Baytril for birds or just Enfloxil, either should come up with lots of choices. I like the 10% injectable... it can be given orally or by injection.
I found baytril on dr fosters and smith website. There is a 22.7mg, 68mg, or 136mg, taste tab chew tablet. What strength and do you have a preference where to buy? I haven't come across the injection yet but I'm still looking.
Tablets are too difficult to use correctly, liquid is much easier:
Banned for use in poultry, so read this before using:
Consult a veterinarian for dosing instructions
I don't believe that the bottles above have any manufacturing info on them and they certainly are not meant to be used for injections. IMNSHO, injectable anything should come from a sterile, sealed, container.
Oral Baytril 10% (100mg/ml) - $25.49
Generic 10% injectable (100mg/ml) - Prices usually start at around $20