I can't find them at my supermarket (just soy) or Whole Foods. Maybe Trader Joes? Do you order them online? Also, what exactly are they? It seems they are used as a soy sauce replacement in recipes. Is that correct?
Here are some links... I'm sure you can find other places that sell this stuff.
I've found coconut aminos by Coconut Secret at Whole Foods. They should be with the other Asian soy sauces, tamari, liquid aminos, etc. If not, just buy them online. Yes, they're generally used as soy sauce replacement. Great for stir-fry!
I get them from the company Azure Standard. They have monthly drop points around the western half of the US, and have great prices! I just ordered Coconut Aminos under $5/bottle when you buy a case, or $5.25 for a single bottle.
My Whole Foods has it, too. Have you asked? Sometimes they put things in odd places. For example at my Whole Foods, Organic Valley Pastured butter is back in the dairy section with the milk, yogurt, kefir, and other butters. KerryGold butter is up in the deli section of the store with the packaged cheeses and sausages. Just because it wasn't were you would logically expect it to be doesn't mean they don't have it.
Also, Azure Standard has it, too, if you have a drop point near you.