Mirrycle mirrors are good and are inexpensive.
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Used to ride my bike 10 miles to work (one way) and probably did that for 20 years, more than 75 times a year. I had a few close calls... one with a city bus. I called up the municipality and complained and got a call back half an hour later from the supervisor who said he just checked the onboard bus cameras and said he was “absolutely horrified” at what he saw. I asked what happens next and he said “action will be taken”.
Of all the mirrors I’ve used, I highly recommend the ones that clip on to one’s glasses.... you end up with a much bigger field of vision, you can tip your head a few degrees to get an even larger range and you can do all that with a quick glance to the side. I highly recommend them...
https://www.rei.com/product/752285/bike-peddler-take-a-look-mirror
I couldn’t find the one I use but it’s like this...
I tried one of the glasses-clip-on mirrors before buying the first Mirrycle, but in winter they were often blocked by my jacket's left shoulder area being blown back and up in the wind. Also, I could not get it to be sufficiently stable. It was much better than nothing, but the Mirrycle mirror was always where I expected it to be, and always showed the same view behind me. It just worked.
We always remember the close calls. I saw a mailman's car approaching me in the mirror. When the car should have veered away from me, it just kept coming. I quickly turned the bike off the road and almost into the woods before stopping. He plowed over the area where I had just been. I don't think he ever noticed that I was there. Maybe he was sorting mail.