Sun is, AFAIK, Huish's "budget brand" (they have tiers).
If you have a Walgreen's nearby....
The next higher level is Walgreen's liquid in the blue bottle (marked "Compare to All". It works just like All liquid does (no enzymes).
But the Walgreen's orange bottle HAS enzymes and works even better than Liquid Tide! I'd say it edges out Costco's Kirkland liquid, and smells nicer, for less $$$$.
Walgreen's also sells a full array of Sun-branded detergents, softeners, dish liquids, dishwasher powders, etc.
I still like my local store-brand Cascade knockoffs better, but only because I can use far less and still save money.
But those of us who lead low-soil lives should give these economical liquids a whirl. They seem to be much gentler on clothes in the long run, which I was surprised by.