This has not been my experience as a consumer trying to buy 18650 batteries for my 3.3V ESP-8266 projects. Is there a good place to buy these? Searching Amazon for them shows me tons of AA and AAA batteries but no actual 18650's. In the past couple years, the price has gone up for me and the availability down.
Are there better options? I've read about 26650's but I have never tried them. Do they last longer? Are they safer? Can I charge them in my NiteCore charger that works great for 18650's?
How can a consumer/tinkerer wanting to scale up production take advantage of these options? The prices may have gone down at Tesla scale, but not at consumer scale.