The infamous "toilet seats" were actually what people would usually think of as a whole toilet without the plumbing parts. And they were specialized pieces that had to fit in a very specific place on a combat aircraft and meet lots of exacting specifications.
Saying the military paid $640 for the same kind of toilet seat you might put on your toilet at home is more than a little misleading.
Not the kind of toilet seat you are talking about, but you can easily spend that kind of money for a home toilet seat: https://www.liftcaregiving.com/shop/products/urinary-tract-i... (Not an endorsement -- I just grabbed it at random from a Google search).
I actually do have a similar type of toilet seat (as do most other people in Japan). Some optional extras you can get on toilet seats include a heated seat (highly recommended if you don't have heat in your house) and a fan that vents odours.
There are only 2 furnishings in my house that I wouldn't give up. One is the toilet seat and the other is a bath that pours itself and maintains a constant temperature with a recirculating pump. Worth every penny and more.
Saying the military paid $640 for the same kind of toilet seat you might put on your toilet at home is more than a little misleading.
https://en.wikipedia.org/wiki/Toilet_seat#US_Navy.27s_.22.24...