Name: BANDAI NETWORKS TYPE-KIVA Vampire's-jet helmet
Category: helmet
Price: JPY22,800
Release date in Japan: May 22, 2008

Once again, into not-really-a-gadget territory:

Until July 31, you can order the "TYPE-KIVA Vampire's-jet" helmet themed after the currently-airing Kamen Rider KIVA TV series. It's black with red motifs of roses, moons, and chains; if you're watching the fast-riding vampire hero on Sunday nights at 8 pm on TV Asahi, that probably all means something to you. Buy it at LaLaBit Market.

More info: http://www.bandai-net.com/corporation/release/release.php?id=1089 (Japanese)
http://lalabitmarket.channel.or.jp/site/feature/ch02.html (Japanese)