Schoolie, first of all I think it is good to define your terms. Your post title says "archtop acoustic" - to me that is a very specific guitar. First and foremost it is an acoustic guitar - optimized for play and sound without amplification. It
might have a pickup but if it does it is designed to have minimum impact on the acoustic sound - normally the pickup floats off the end of the neck and does not touch the top.
The top is almost always a carved single piece of wood - usually spruce. The arching and carving is designed to optimize the tops vibration. Most of the time the carving, at least the final voicing, is done by hand.
Acoustic archtops date back to the Loyd Lloar era at Gibson and include guitar such as the L5 and all the following carved tops. A few have round or oval holes, most have f-holes. Typical guitars start around 16 inch across the lower bout and go up to 18. Size really does matter when you are playing in a big jazz band.
Almost by definition those guitars are expensive. There is just a heck of a lot of hand labor that goes into their build. Yes you can cnc the top but the best ones were done by the great makers, D'Angelico, D'Aquisto, Benedetto, et al and includes Epiphone.
The other variety of archtop guitar is the laminated pressed tops found on the Gibson ES series and most of the copies. In general these are electric guitars and were designed to be plugged in. They can be played unplugged, of course, but they are not optimized for this - the tops don't vibrate like a carved piece of spruce, they tend to have heavier braces, the pickups are screwed to the tops. These guitars are much easier and cheaper to mass produce - one you have tooled up to form the tops you can turn out a lot of them. While these guitars do have arched tops I prefer to call them "hollow bodied electrics" to differentiate with the carved acoustic ones.
There are a lot of guitars in that latter group ranging from the classic Guilds and Ibanez jazz guitars to a lot of modern ones. They should be easier to find and more reasonably priced - you just need too play them to find out. I put the Godin 5th Avenue in that group - the one that crossed my bench was a very nice guitar but it was not a true acoustic
View attachment 986635 View attachment 986636 The P90 and pots screwed to the top tells me that this was intended more for plugging in than not.
I've built both kinds and consider them different styles of guitars for different purposes. Here is my electric hollow body and my carved acoustic
View attachment 986637 The sounds are similar - both are punchy with good note separation, short decay, biased towards the fundamental. The acoustic is remarkably loud and it probably has the most head room of any guitar in my collection. It is a very different sound from a flat top, I find myself playing different music on it.
So, short story, if you want an electric hollowbody there are lots of choices and some fairly reasonable. If you truly want an acoustic archtop the choices are limited and will tend to be expensive. Be sure to play before you buy.