Fish antibiotics used to be a lot cheaper before prepping became more mainstream. Once they figured out what people were really buying them for, the prices went up.

If you're going to buy some, I suggest you do some research and make a list of what antibiotics work for which things. You need to know dosages and how many days of treatment.

I have bought Thomas Labs before. The pills/capsules shape, coloring, & imprints are identical to the human version. Drugs.com has a pill identifier. I wouldn't trust any other brand.

I have read that they can be good many years (up to 10 yrs) after the expiration dates if they are kept. I wouldn't recommend taking them that long after, unless of course, that's all there was.