The International Space Station (ISS), at an estimated cost of between $35 billion to $160 billion.
Darmstadtium, is an element. I'm not sure if it's the most expensive but the element only lasts a few milliseconds, making it hard to obtain and extremely valuable.
2 dollars
bioootch
$40,000
a motor bike
fender
It might be a Choprad
newbery
One of the world's most expensive shell is Connus gloriamaris
The most expensive pedicure in the world is $225 in Austin Texas, by Allison
The most expensive car being manufactured and sold today is the Bugatti Veyrnon.
The most expensive fondue in the world is about 80 dollars. The worlds least expensive fondue is about 35 dollars.