I was just at my local Michaels craft store and found tubes of glow bracelets ( 15 bracelets in each) for $1.00. I had to get a handful for Burning Man :). Though we had an amazing storm that knocked out the power earlier so I opened a pack and put them on the kids( that way no one gets stepped on in the dark). I'll let you know tomorrow how long the glow lasts.
Sharing the thrifty fun,
Freedom