The reason that the common lady beetle sold retail is field collected is that it is way, way cheaper. The species in question, convergent lady beetle, has a unique habit and forms large aggregations  at the end of their season.  The biggest of these are in the Sierra Nevada Mountains, where lady beetles that earlier fed and developed in the fields of the Central Valley fly to areas where they will remain dormant. These aggregatations are can be enormous, and collectors can literally collect beetles by the shovelful.

On the other hand if you wish raise a lady beetle you must provide enough food to support each one through their development.   And each developing lady beetle larva would require many hundreds, probably over a thousand aphids as prey/food before they became full grown adults.  So the logistics of raising that many plants to raise enough aphids becomes huge.

There are a couple of lady beetles that are raised. Most common is the mealybug destroyer which is sold for control of citrus mealybug and has long been used in California citrus orchards.   Those seem to retail at about $0.25-$0.35 apiece versus a couple of cents apiece for the field-collected convergent lady beetles.

There are a fair number of companies in the business of rearing some insects for the biological control of other insects. And I have a list of suppliers of those organisms at: https://webdoc.agsci.colostate.edu/bspm/InsectInformation/Factsheets/BioControl.pdf

One of these, green lacewings, which can be more easily reared, can substitute for lady beetles.  There are also a couple of other predators, parasitoids and fungal pathogens sold to control aphids.  These are in the sheet referenced above.

I hope this is some help.  I see you also tried to contact me directly.  If you have further questions use that email and I can get to it tonight.