They used to sell them on Amazon until they got wind of it. An old homeless friend taught me that trick, and as someone who was uninsured in the US for a long time (my health plan for most of the last decade was “worldwide, excluding USA”) I used it a number of times when treating minor infections (versus giving the urgent care $200).

Make sure you take a full course, in any event, and recall that many bacteria these days are resistant to Penicillin.

These days, I stock my prepper kit of antibiotics from https://www.alldaychemist.com, and they take bitcoin now too.