$1.49, regular price $1.99 Uses a single AAA nicad and a single led. The solar cell on top is epoxyed in place so it can't be removed but the rest comes out easy enough. There is no on/off switch, the nicad is protected against discharge until purchase by a piece of paper in the battery holder.
The circuit has a resistor and a 5252B. The chip has 4 leads on the same side. I don't see anything on Google that matches that number and configuration, but a 5252B is normally a 24v zener. I wonder about that, though, since 1.2v from that AAA nicad shouldn't be enough to light an led.
Decently bright, but not enough to light a room, even with the bezel/reflector removed. Not shone in the picture is the ground stake.