Hello @jsngrss and welcome to the RobotShop forum,
Is the M12 / CS-Mount glued to the board or can it be removed to attach custom mounts?
The manufacturer didn’t mention this information in the specifications but the product listing does mention: “customizable” lens. You could contact them directly and ask if it is easily removable.
Can the camera be bought without the lens shown on the website to reduce price?
No, but there is another option, you could purchase this product instead:
Which is a camera replacement for this module:
Or get this one:
But that last version is NOT compatible with Raspberry Pi, only with the compute modules CM3, CM3+.