$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.

Having built a few medieval contraptions over the years, it’s going to be at least $100 for the wood alone (and that’s if you use 2x4s), and the blade will probably be around $50 for just the steel.

Guillotines can be a little finicky if you’re not careful during the building. It’s a decent bit of weight slamming down, it needs to be on-track and aligned with itself or you might end up lodging the blade into the frame.

This contraption was invented in France. Keep your 2x4.
Country of origin is irrelevant, you use the materials you have available.
I was just making a joke about measurement systems and that US people have a weird kink with 2x4. As if the whole US is built on those. Including the Statue of Liberty.

They’re not even 2x4, we straight up lie about it! They’re 1.5in x 3.5in.

Not the ENTIRE US but most modern homes are built with 2x4s, so in a way, the US is kind of built with them.