Yi 4k is $250 and is similar spec'd to the Hero4 Black but half the price. You could also look at the GoPro Sessions, solid option for $200.

You get what you pay for with action cameras. Chinese knock-off? Expect knock-off quality. The Yi 4k is the only one that breaks the mold of that AFAIK.

I personally have a Hero3 I won five years ago in a video contest, Crosstour Action Camera I use for my rear on my commuter (when I remember to charge it). And for my race bike I have my Fly6(ce), but I will use it on my commuter if I forget to charge my other rear camera.

Here is a list of common ones:

Inexpensive (< $100)

1. AKASO Action Camera 1080P HD EK5000 amazon link

• Handlebar and Helmet Mount included, very low quality video

1. Drift Stealth 2 amazon link

• Low light is not great, otherwise fine camera

1. Crosstour Action Camera amazon link

2. Yi Lite amazon link

Mid Range ($100-250)

1. Contour ROAM2 Waterproof Video Camera amazon link

2. Yi 4K Action Camera amazon link

3. Garmin Virb Elite amazon link

4. Sony HDRAS100V/W amazon link

5. GoPro Session amazon link

High End ($250+)

1. GoPro HERO5 Black amazon link

• Really, any of the GoPros will probably do very well. They aren't know to have the best battery life, though

1. Fly12(ce) camera and front light amazon link

2. Xiaomi Yi 4K Action Camera 2 NIS Store link

3. Fly6(ce) Amazon link