Where can I buy amoxicillin?

I have a cat with an upper respiratory infection and I need to buy , amoxicillin, Amoxidrops® or
Clavamox® but I need it soon. I don't want to wait a week for 1800 pet meds to deliver. Is there a store I can buy these meds? Does petsmart or petco offer these? Or is there another store that does?
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