buy A4 Copy Paper

I need to find a Helmet light strip, that must be any type of water resistant lighted strip to be stick at the back of the helmet for safety reason. As long as the products design/material meets the element of " can increase visibility" of the motorcycle rider, its would be acceptable. Not to forget, its also should be innovative, unique, simple, easy to use, reliable and most important is it should be affordable to be bought by Motorcycle riders. My target price should be around RMB5-RMB10.