Just to get my Canti costume to "done" (actually about 98%, but enough to wear) was about $800.
$160 on polycarbonate platic sheet
$360 in electronics (LCD TV, computer monitor, batteries, camera, Arduino board, DVD player, various other audio/video components, sensors, and IC chips)
$40 for the gloves
$40 for shoes
$50 for other clothing
$20 for backpack
$30 for fabric
~$100 in some mistakes and ideas that didn't work out.
Just kinda an estimate. It was way more expensive than I ever planned, but now that it's pretty much done, it costs almost nothing to revamp, do some paint touchups, fix minor flaws, etc. Definitely a bigger project than I originally estimated. It was a year from concept to completion.
ditch - a safe place in an unsafe world