It is cheaper to make one than to buy one.
You can make it whit your favorite LED color,red,green,blue,yellow,RBG...
This was my first electronic project, so I recommend it to all beginners in the interesting field of electronics.
This bike light is easy to make,looks cool and most importantly, effective!
Step 1: Components
1. LM 555 timer chip
2. 180 K ohm resistor
3. 330 Ohm resistor
4. 0,22 uF, 16V or 100V capacitor
5. 9V battery snap
6. 9V battery
7. LED (go to step 2 so I can help you choose which one)
8. Circuit board
9. Plastic housing for electronic circuits
(ALL OF THIS COMPONENTS CAN BE BOUGHT AT YOUR CLOSEST ELECTRONIC COMPONENTS SHOP,RADIO SHACK STORE.)