Sigh. Can't say I'm excited to spend $70 (cateye x3 needs a $10 adapter for aero posts) for a basic LED that blinks. I have a $10 light that performs plenty well for me.

I've decided that I'm going to go with a top tube (gas tank) bag instead of my saddle bag. Those aren't cheap either but one bonus is that they're slightly bigger and more accessible so I may be able to put my phone in there.

This will mean I can get a rail mount for my rear camera. If anyone could point me to a cheap rear light that actually fits an aero post, that would be great. EDIT: What about the giant numen plus aero? It looks pretty sweet too.