I’m partial to Chuck Harris’ product. I believe his daughter now runs the business but may be inactive at this time. There are some “copy cat” products but i have no experience with them.

http://www.dispatch.com/content/stories/local/2012/08/22/gambier-cycling-enthusiast-dies.html

https://www.facebook.com/pages/Chuck-Harris-The-Mirror-Man/434695303248672

There is also a version that clips to your helmet. The wire portion of the mirrors are actually made out of bicycle spokes and are very strong. If you attach it correctly, you can pick up your helmet with it.

The contact information is:

Ultra Light Touring Shop
PO Box 363
Gambier, OH 43022
(740) 427-3404

bjcoleman@netscape.net