Iron Man Auction -- The Whiplash Suit, Tony Stark's Suitcase, The Hulk's Head ... ALL FOR SALE!!!

It might be the ultimate nerd-boner auction of all time -- 225 of the coolest props ever from "Iron Man 2" and "The Incredible Hulk" ... including Mickey Rourke's incredibly badass Whiplash suit ... all available to the highest bidder.

The auction -- organized by a group called Propworx in conjuction with Marvel Studios -- just went live on LiveAuctioneers.com ... and it ends October 22nd.

If you want to bid, you better have cash -- because the Whiplash suit alone is expected to bring in between $5,000-$8,000. Thankfully, the suitcase is valued at a more affordable $2,000-$3,000.