I got this one on Amazon. It is by Quarton at around $54. It is better construction but does not appear superior to the $18 ones on Adafruit. The Adafruit ones have a thrid wire for PWM which I haven't tried. I assumed fading them in and out would be a great effect. As you can see in the photo the line is faint probably because it is spread out unlike the dot, but I don't know. It is also 5mW and uses up to 50mA. I drove it at 5V but it goes to 2.6V. Lasers like a constant current source, but maybe I can fade it. If I got a power supply I can try, but power supplies are a major pain until I get to around $1500 for one. The noise on them gives false results in anything non-basic, so I kind of hate them. At companies that buy cheap equipment, I use batteries for everything.