I think I got mine (audiovox, see above) for $99... no stalk, just a little control pad. The actuator was pretty big though, I hid it under the battery tray. Had a cable that ran up to the throttle linkage, lucky for me the existing brllcrank had a second attachment for what would have been the factory cruise.
Connections were vacuum, 12V, ground, brake light, and tachometer. They're really kind of simple, all it does is keep the incoming signal (RPM) constant by changing the actuator (throttle), and cut off if the brake light comes on or the signal changes too fast.
Kinda wish I had one on my truck, but it wouldn't work... with my tiny engine and the long hills around here I'm shifting too much.