Red Boat is a trademarked brand. They are the only company making anchovy salt. It’s divine. I’m sure you can find it online if you don’t have access to a large, well stocked Asian grocery.
We have several. Thanks Root-Beer Man for posting that link. Seeing an image of the product will make it easier to identify in the store. OTOH, I hope it costs less than the internet price in the store. Twenty bucks for a little over half a pound seems more than a tad steep. I just bought a pound and a half of Himalayan Pink Salt for about $2. Good flavor, less harsh than regular salt.