$5 Twin Laser Bike Light
erco
Posts: 20,256
Get out yer wallets, just $5.55 w/ free ship! Two line lasers project a "virtual lane" behind your bike. I had seen this on several websites previously, and here it is. Just how visible it is to a car behind you remains to be seen. But a decent value, maybe someone needs two line lasers for a David laser scanner. The lasers have steady and flashing modes, and can be switched on independently of the LEDs and vice versa.
http://www.ebay.com/itm/321119013806
http://www.ebay.com/itm/321119013806