They don't have to spend 22 hrs on a plane. Just "move" the "main" office there and staff it with a local janitor. I'd guess the number approaches zero, where places with lower tax rates are probably a good bit higher.
The first one I posted is just a regular old hammer the second one is also, no dead blow or beryllium or anything like that. One thing that raises the price up is that they are required to buy made in America if possible. Which the one I posted is. And you might be surprised at what some nuts and bolts cost.
Could it be something like what's referenced by one of my favorite lines in Independence Day - where Jeff Goldblum's dad says 'You don't think they really pay $600 for a hammer, do you?'