I had been thinking about adding navigation to my new Yaris iA. Even though I have both Apple and Google navigation apps on my phone, there have been cases where I don't have a cell signal and the map info hasn't been available. Plus, having it built into that larger display is just a lot more convenient and easier to access.
I took the plunge and bought the navigation card from a seller on Amazon. Buying through eBay makes me a bit nervous, and I know Amazon will most likely back me up. I paid $176.40 for it. I was worried that I might get a bootleg copy of the chip, but no, it came in original, sealed, Toyota packaging. Installation was super easy, of course. And I plugged it into my computer to update the maps to the most recent version, issued in February 2017.
I haven't used it much for navigation yet, but so far I like it just fine. The top of the screen continuously shows the next upcoming street; the voice is pleasant enough. So for the money I feel like I got a good deal. The only thing I don't have is the manual for the nav system, but that was readily available online and now I have it on my phone for easy reference.