Bruce Schneier’s DefCon 15 Speaker Badge can be bought on eBay auction. The badge contains a programmable LED with up to 14 characters. It uses two Li batteries (included), and was designed by Joe Grand. If you wish it, hurry up. Auction ends Aug-22-07 13:41:36 PDT. Upon completion of this auction, Schneier will donate an amount equal to the purchase price to the Electronic Privacy Information Center.
You can also see post and interesting comments about this auction on Bruce’s blog (here).