Try asking your LBS for a rack-mount blinkie. I did. They rummaged around in their "second-hand crap" box, and gave me one for =free=! That didn't work.

All of the awesome blinkies, not to name name-brand-names, but =all=of=them=, have rack-mount adapters available to order, tacking on another five bux (plus a week's worth of special-order shipping) to the cost of blinkie-having. My generic, made-in-The-Phillipines, 6-LED, waterproof, awesomely bright blinkie was seven bux at Benny's Hardware, and came with both a seat-post-mount and a rack-mount.

Man, I got money, as being a backwoods New Englander, I don't spend it on much. I like to spend for quality (Ask Velo-Orange, they ought to have a "indestructible stuff a dumb swamp yankee paid cash-money on" category by now). I don't pay companies to rip me off. Include the damn rack-mount in the box of your overpriced blinkie, fer chrissakes. Cheaping out on this little thing makes me leery of your whole operation.