rear blinking light

I gave up trying to find one. Instead I used the smaller of the two round mounts that came with a tail light. Wrapped some rubber around one of the seats two metal support rods in the back, and mounted the light there. works perfectly.

OR

Get a saddle bag that has a spot to clip on a tail light.

This is the one I use.

Rechargable and very good. I put it on my seatstay.

http://www.rei.com/product/852297/serfas-thunderbolt-usb-rear-bike-...

I have a cheap blinking light that clips onto the bag that under the seat. You need to take tools and spare tubes when you ride right.

While not cheap, but the dinotte 400R rechargeable is pretty much the state-of-the art for a massively powerful rear red strobe blinking light. Heck, you'll outshine some emergency vehicles. These rear lights are even made for daytime use, which, in the age of highly distracted driving, is unfortunately a new daytime biking essential. (And, fyi, no connection between us and this company, just an impressed user of their lights.)

Greg @ dsw

I just found one at Performance Bike (not sure if you have those at your area but they ship too) that has rubber straps. I mounted it very easily on my seatstay. It is similar to this but was cheap (like $15) so you could get a couple and be very visible.
http://www.performancebike.com/bikes/Product_10052_10551_1126628_-1...
I have another regular light that I actually just taped below my seat (thats a pain but it works OK if you are good with electric tape). And then I put one on my helmet too. I like to be a beacon of light :-)

thanks a lot for the responses, the saddle bag would be nice if i used a saddle bag..have all my tools in the specialized bin that stays in the cage mounted behind my seat. i will definitely be checking out some of these options.

Got this one on my Christmas list. Followed one during a century ride and had to ask the fellow which light he was using. Out of all the lights out there, it really stood out.

I like designshinelighting.com. This is the brightest light I have ever owned. I am stopped at least once a month by cars, motorcycles and bicyclists asking where I got the light. A sheriff officer even stopped me once and stated he wished all cyclists ran a light this bright. The owner is very easy to work with. He uses a Cateye mount so he probably can figure something for you. He has pictures on his sight of solutions that might work for you. I ride alone most of the time. The light is well made and blinding when it is ran at full power. On group rides I turn it down. Cars do not to buzz my handlebars anymore. His videos under state the amount of light that is generated. Seeing is believing. I have no financial interst in this product.