Here's what I know about buying Baytril.
If you want brand name liquid Baytril (enrofloxacin), in a properly sealed, injectable type bottle, you're going to need a prescription from the vet, You can purchase it from places like allbirdproducts.com and and finchniche.com without a prescription, but it will look like this:
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.
This is what you get when you buy it with a prescription:
Above is Baytril in the 22.7mg/ml strength
Above is Baytril in the 100mg/ml strength
I bought some 100mg/ml from overseas and it looks like this:
I have treated a few birds with the above bottles and have been quite happy with the results.