I've seen it in my local grocery store in the cleaning isle. Though it's usually in such large bottles I don't know that I'd ever bother. You only need to use like 5 drops a day until you can add fish. At that rate you'd barely make a dent in the amount that you bought, and I'm not sure if it has a shelf life (i.e. loses it's strength over time) so you might not even be able to keep it for the next time you need it. You are better off just using fish flakes. A few flakes 2 times a day and you will get the same result, and then once you add fish, you just keep using the flakes

. That's just my 2 cents though. Good Luck!