Very cool idea, I've often found myself with the same impulse.

Quick google turns this up: http://www.papachina.com/Outdoor-Ite...730/index.html

I have a feeling that your budget will pale in comparison to one belonging to an Ivy League school, but every fall cornell security has the university logo silkscreened on a ton of these hands them out to students:
http://www.papachina.com/Outdoor-Ite...duct_info.html in my experience they're not amazingly bright (duh), but they're certainly better than nothing.

If you'd like to purchase in quantities less than 1000 to a batch: http://www.windycitynovelties.com/70...eflectors.html