Well, the 3-LED hocky puck lights have finally made it to the Dollar Tree stores in the South Texas area - and they ain't too shabby!
On my sample, the LEDs are kind of blueish, but quite bright. The push-on/push-off switch works smoothly. The peel-off adhesive-backed tape on the back side would be kind of iffy for long-term attachment on a horizontal surface, but it'd be easy to drill several holes in the removable plastic battery compartment cover and secure it with wood screws.
Appearance-wise, they are pretty similar to the Sylvania Dot-It lights.
BOTTOM LINE: Definitely worth a buck apiece. In keeping with the low-budget motif, Dollar Tree also sells 8-packs of carbon-zinc AAA cells and 4-packs of alkaline AAA cells under the "Sunbeam" brand for a buck.