As I ride more on the roads, I begin to feel the need for a rear camera(and one of those lovely neon "you are being filmed" icon signs I've seen floating about cycling twitter), but frankly I'm not rolling in spare cash at the moment - are there any affordable options?
From the various listicles and reviews, my first impression is that the cheap options either don't provide enough resolution to guarantee catching a license plate, or have teeny-weeny batteries that will last 90 minutes if you're lucky; then there's a jump up into the multi-hundred-quid range without much in between. Am I missing something?