I ended up adding the hardwire kit to my VIOFO order for $16 but didn't realize it's shipping from China. It's going to take a while to get here. Hopefully no accidents happen before it arrives.
That's unfortunate. I bought everything from Amazon so I got it all fairly quickly.
You'll also want the general stuff needed to install the hardwire kit, like a multimeter, fuse taps, and a set of fuses. Don't make the mistake I did, get the right type of fuse tap for the fuses in yours. I don't know if it's the same as mine, but mine was Mini-LowProfile fuses.