from the op description they are in fact a very complicated seamless bifocal. likely some of the most expensive lenses to make. idk, to a certain extent op is looking for a modern luxury item and mad that it’s expensive. like they don’t NEED seamless bifocals, it’s just Better for their condition. they could spend less on thicker cheaper bifocals, they just wouldn’t be as nice.
like it sucks that most glasses are uncomfortable for them, but sadly this has simply resulted in them needing expensive glasses if they get this spec. it’s kind of like someone saying they need a car that’s fast, fuel efficient, rides great, looks cool, is safe, and has lots of storage but are confused why they can’t find a good deal on that.