That is very store dependent. Last time I checked, my local grocery store only had premium brand dry detergent but had discount brand liquid detergent that was cheaper than store brand (which is what I use). I did the math, and the price per load on the dry detergent was not that good. Obviously, my math assumes that the advertised loads per package is true (which is assuredly not the case) or, at least, that brands have the same degree of inflation in their figure.