Lots of LED head and tail lights are blinkies (or have a setting that way).

I have the first one described here (the second one I found looking for the first one, 'cause I couldn't remember which syllable mangled the spelling).

http://www.reallite.com/RLHome.htm
http://www.reelight.com/animation_pop-up.html

You can get "regular sized" ones at nashbar or performance or the LBS... yea, far as I can tell, just about all of 'em are made in China...