I just got these:
http://www.ebay.com/itm/110778555542...84.m1497.l2649

Less than ten bucks, with shipping. I have only put the front one on. I rode after it drizzled a bit this morning and was glad I had it. It vibrates a wee bit, but doesn't bother me a bit on the road. It doesn't weigh enough to worry about for me and was quite easy to install.

Oops, forgot.......they are on a five year old Trek 7200.