Yer cost per gal of ready-to-use product of the latest products (several listed on this thread) if you mix according to the labels will be probably be several cents less per gallon as compared to your Certifed brand. But it's worth noting that todays formulated encap products are recent formulas. And you will use them differently (shower your pads, spray ahead of your bonnets. Your Certified product was designed and sold to mix in a mop bucket, soak your bonnet and ring it out. If you have been doing that for 20 years I'd suggest changing your bonnet methods along with a product change.