'Iron Man' Cost Of Suit & Gadgets: The Real Price To Pay If You Want To Be Iron Man Tops $1 Billion
http://www.huffingtonpost.com/2012/07/31/iron-man-suit-gadgets-cost-one-billion_n_1724626.html?ir=Canada
Of interest, it is a lot more than the cost to be batman. As a bonus you don't need to spend years on all that special training.
Oh man, there's a guy who built a kick ass Iron Man costume with working helmet, lights and backpack jets that actually move.
If I can find the video again I'll post it!