i used to have one of the cheap torch cams did the trick here is a video taken with it way back in 2011
Have a look at the Techmoan website the mobius looks a good option and one I will be using when my current one goes.
it had one built in or you could run it from a usb lead with a fag lighter on the end think it lasted over 2 hours or so before you needed to recharge it
How much pressure can the bank take before it breaks?

It's easy to wire them into a car and hide the cables, plus when the car starts the cam instantly powers up and starts recording. Lots of people wire them to the interior light circuit, my car has a spare power socket which comes in handy.
I have two of these ( not in the same vehicle) Bought when they were £20 each about 2 years ago. I've wired then to the ignition, instead of fag lighter, so they are always working when the vehicle is running
Cheap, been very reliable and do the job, just glad to say I haven't had to use anything they've recorded yet![]()
This is a fraction over http://www.amazon.co.uk/KingMansion-GS9000-G-sensor-Blackbox-Recorder/dp/B00CPZRGSM/ref=sr_1_3?s=electronics&ie=UTF8&qid=1389126763&sr=1-3&keywords=ambarella camera
This is a little under your budget. http://www.amazon.co.uk/E-PRANCE-Original-Ambarella-Resolution-Memory£¬Support/dp/B00F5WPCW4/ref=sr_1_13?s=electronics&ie=UTF8&qid=1389126785&sr=1-13&keywords=ambarella camera
I have one like the first model and the image quality is excellent see vid below which has been compressed to get it onto youtube, a 10 minute video out of the camera is about the 800mb mark. The cameras need to be cigarette lighter powered, they have a lithium battery but it's usually only good for 5-10 mins or so.
If you've got an android phone Daily Roads Voyager is pretty decent..... got this footage the first day I used it
I stopped and spoke to the guy in the Focus and ended up sending the footage to his insurance company (the blue van that he hit was performing an illegal u-turn)
Just a couple of points...... The footage is a little "trippy" as I had hadn't fixed the focus and it looks like I'm travelling a lot faster than I actually was. You can also get it to imprint the speed and location coordinates and the app itself overlays a map on the phone to accompany the footage
That's a shame![]()
Are there any that do gps and log the car's movements incl in case of collision.