(YouTube link)
This guy made a Mecha {wiki} costume for Halloween and spared no expense.
Sheet metal, aircraft aluminum, and other parts: $600.
Rivets, bolts, hardware: $250.
Tool purchases/rentals: $200.
Spraypaint: $90.
Truck rental to carry costume: $210.
Hours: 250+.
Looking like you could take down a tank: priceless.
It's a good thing he rented a truck. That's a lot of weight to walk home in, considering he couldn't fit through a bus door. -via reddit