The Sigma Sport is available at REI for $9.93. Here is the link:
http://www.rei.com/outlet/product/47...SHP_CYCLING_SA
I also purchased 3 Planet Bike BRT-7 7 LED lights there for $6.93. Now that I have them, I am going to buy several more..I'm using 850mh NIMh rechargable batteries in them, and they are BRIGHT. They come with arm strap, seat post mount, clip mount, and two batteries. Here is the link:
http://www.rei.com/outlet/product/47...SHP_CYCLING_SA