$50
Don’t know where you’re buying materials, but it would be 4 times that, at least, for the raw materials. Still worth it.

True to form I would’ve pegged it a fair amount higher then 200 bucks as well, somewhere in the grand range.

Gotta figure a gun and bullets is going to be cheaper until you start getting into triple digits, though the guillotine has a certain aesthetic.

Guilottine can kill all the billionares and rulling class for just a 1 time investment. A gun you have to keep buying ammo. At some point the guillotine wins. And worst case you could go to the scrapyard to get the steel for the blade and into the forest to get some wood to make the structure. Might not be as nice and all but should still chop off heads.
The presumption there is that we somehow got all the folks needing to be got in one spot, which you have to admit is a lot of presumption.