However, that has it's own cost; it probably doesn't eliminate jello wobble from vibration
Indeed. The G10 video I posted doesn't wobble - because it was handheld. For any suction cup mount one needs anti-vibration "something" to decouple the camera from the airframe. I am making up a mount using four of the sorbothane bushes I posted a link to earlier. It took a while to find a US outlet willing to ship to distant foreign lands
I don't know what is the cheapest camera with shutter priority, but high-end prosumer camcorders go for a few hundred quid on Ebay, though most of them will be the DV tape models which can't record for more than an hour (on their own).