I'm not sure if you saw in the comments on your Quisp Ring post awhile back, but I had this helmet in storage, so after finally moving down here from SF in May and after getting settled, I was able to dig it out.
I'm in between gigs and need rent money for next month, so I'm gonna list it on eBay. I have no idea what is it is worth, but based on the ring and some prelim research, I put an outrageously astronomical 'Buy it Now' price on it, so I wouldn't get low-balled on the auction in case it has some value. It's in great shape and works fine, so who knows!
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.