I pay $5.50 for the Blaze Orange model at John McCann's site.
(No affilitation...etc, etc.)
I've become a big fan of that site, have ordered a ton of stuff the past few months. Several shipments. 110% satisfied. I now take the fact that they carry a product as a credible endorsement.
http://www.bepreparedtosurvive.com/SignalingProducts,%20Starflash_Signal_Mirror,%20Fox_40,%20Emergency_Pocket_Strobe,%20ACR_Firefly_Plus.htm