It's this one from Performance. It's only $13. I like it much more than the $25-$40 TL-LD1000 from Cateye which I had until it fell apart way before it should have. The Performance one runs on AAA like my other lights and blinkies, so I only have to carry one type of extra batteries. It's really bright. Unlike the Cateye, it is clear, so there is no light lost. It also has a built in reflector. The only thing I don't like is the rubber gasket, which seems a little thin and which you have to finesse into place each time you replace the batteries. But the TL-LD1000 is certainly not two or three times as good even though its two or three times more expensive.

One advantage of a $13 blinkie is that you don't cry if you lose it.

The higher elevation is one of the big advantages of clipping a blinkie on this way. I should have mentioned that in the original post.

+1