If you are content with the massive spherical abberation in the one above, then almost any "HD" USB webcam will do just fine.
Ages ago, I actually did get a pretty fair result from a Micro$oft £50 webcam. No real distortion, too, and better than the £140 Dogcam whose main claim to fame is that you can mount it outside the cockpit (it is weatherproof) which is OK if you do a decent job of it, and nobody sees it
