Those are nice lights, a little bigger than a Photon II and uglier, but certainly functional, and you can change the batteries without tools. There are two versions, one with the slide switch and one without. If they're selling the slide switch version for $5, that's a very good deal.

Countycomm also sells some slide switch lights for $1 each in bags of 20. Unfortunately they're out of the white-led version for now (more are expected soon). But they do have red and blue available last I looked.

All these lights are reviewed at the LED Museum, www.ledmuseum.org .