I bought a new Scotts steering damper but when I realized I had to make a weld to my frame I decided not to install it. I paid $431 for it online, and THAT was cheap! Hey, it certainly looked cool in the box!
So, my reason for wanting one? Because I notice the 919 is extremely light. Lighter than any bike I've owned. And it steers REALLY quick! I noticed right away that since the front is so light and the steering so easy, that if you just happen to let off the handlebars to adjust your helmet, wipe a bug of your shield, adjust your mirror, or whatever, the bike does NOT handle well if you are not on a freshly blacktopped road. I notice that the slightest groove or small pot hole or pebble with jerk the steering VERY easily if you have one hand off the bars! Scares the crap out of me! I figured the Scotts would remedy this. All my past bikes, being heavier by about 100 pounds, and not having radials, never had this problem. I'm certainly not going to blame the Michelin radials. I blame the lightness of the front end.
Besides, the Scotts steering stabilizer would have looked cool.
But no, I never did find a "cheap" one that got any decent reviews. I did sell my Scotts for $250 on Craigslist in 1 day! (I took a loss up the *ss on THAT deal.)
Good luck, I hope you find the damper/stabilizer you're looking for. Just beware: the Scotts needs welding on some bikes.