The city of Hiroshima is placing a number of items from Old Hiroshima Stadium on the Yahoo Auction block. Amongst the 884 items listed: seats (11 signed and 685 unsigned), benches, bases, and various signs.
You can already view the items at Yahoo Auction Japan, but the auction itself starts on 11/30 at 1pm and will remain open until 12/7 at 1pm. Those interested will need to register for the auction by the 17th.
Hiroshima city's official website also offers more information about the auction (in Japanese).