When it comes to DPSS laser construction there are no economies of scale. Let's look at the common 532nm. For our company the prices tend to be linear across the line with a small jump at the change to the larger form factor. (mW across the bottom for 532nm)

Others, particularly diode lasers, often increase in price exponentially due to the complexity and cost of generating high power diodes (primarily in the visible range). 808nm and 980nm are the exception because they are very popular (due to pump sources) and because they are easily constructed compared to other laser diode wavelengths.
Lower efficiency DPSS tends to increase in price very quickly as power climbs because the response to SHG is not linear so larger and larger pumping and cavities are needed to achieve modest increases in SHG response.
Gas lasers are all over the board because the composition of the tubes and quality of the systems vary widely. Laser costs seem to be directly related, generally, to current required to operate the tube.
The Frothy Chimp
Cynic Extraordinaire
Back off man, I'm a scientist
Good whiskey, fine cigars, long legged women and blues guitar.
That's what I like.
The strong shall stand, the weak shall fall by the wayside.