Probably cost much more than that once you figure in the power and networking equipment.
If I had the expertise, I would make large clusters with a bunch of the RPi CM3+.
If I had the expertise, I would make large clusters with a bunch of the RPi CM3+.
Since you can't run CM3 standalone, you'll be making custom hardware. Even if you don't count your development time, my gut feeling says that $5 is not enough to cover even just BOM costs for such a project.