You can probably infer that green lasers are more expensive to produce. With more visibility and energy, the materials and way it is made different from the red lasers.
First off, green lasers are more complex to create. Therefore, manufacturing requires more care and time to create. Besides, it also requires more space.
Another reason why it’s so expensive is that there’s more research backing red lasers. It’s easily mass-produced and used for some everyday items like CD players.
On the other hand, the research behind green lasers isn’t as great in comparison. Therefore, to create green lasers for other purposes other than for shooting, additional research has to be made.
Of course, this requires adequate funding, which is another reason why it is more expensive.