Co2 is addressing the extraction method, not "enrichment", and what your receiving as stated is measured by milligrams contained, not liquid ounce.
The cheapest one will obtain CBD is $20 a gram wholesale ($560 ounce), with isolates running much, much higher depending on the source. ($60 a gram/$1,680 ounce retail).
Examine the container and milligrams stated to arrive at the actual content. Nationwide CBD products are also derived from hemp and have much to be desired for those regarding medicinal applications.