From the wiki: https://www.reddit.com/r/Dashcam/wiki/index

• Cheap hardwire kit ($5-15 USD)

• In between hardwire kits ($15 USD)

• Expensive Hardwire kit ($24-27 USD)

Also there are dash cam specific hardwire kits:

BlackVue, BlackSys, Thinkware generally have them: googleable.

There are also acceptable 3rd part hardwire kits: (for BlackVue/BlackSys/Thinkware cameras) Like what blackboxmycar.com sells/makes.

There are also VIOFO specific hardwire kits (sometimes good, sometimes not) 3 wire kit - I couldn't find the A129 2 wire hardwire kit any more, perhaps they stopped making it/selling it (which is a good thing)