This will, hopefully, reduce your chances of getting whacked by a car while biking. Super cheap!
Step 1: Buy Reflective Dots
Wow, mcmaster carr is awesome. Check this out:
6042T1 REFLECTIVE MARKING DOT, 1" DOT SIZE, 64 DOTS PER SHEET, 6.19
6042T11 REFLECTIVE MARKING DOT, 1-7/8" DOT SIZE, 16 DOTS PER SHEET, WHITE 6.19
Buy a sheet of the 1" dots. That's good enough. It should be $10 after shipping