Stand Up To Cancer, the same group that auctioned off an appearance in "Spider-Man 4" a few weeks ago, are now auctioning off a role in Jon Favreau's upcoming "Iron Man" sequel

The winning bidder gets:

1) A visit to the set of Iron Man 2 (one shooting day).
2) A meet and greet with the cast.
3) A walk-on/ extra role in the film for the auction winner.
4) Photo tour of the set with an Iron Man unit photographer to document the tour.
5) Tickets to the Los Angeles premiere for you and a guest. Winner and Guest will walk the premiere's red carpet.

You can bid for yourself right now over at EBay.