650nm 660nm Adjusted Red Laser Line Dot Cross Laser Diode Module 3V-5.5V 100mW Laser Dot/Line/Cross Module Focusable 13mmx42mm with US Power Adapter and Heatsink: Amazon.com: Industrial & Scientific
Amazon.com: 8PCS 3 Pin 650nm 5V Laser Transmitter Sensor Module Board KY-008 Dot Diode Copper Head Sensor Module Diode Laser Mini laser head for Arduino Raspberry Pi Laser : Industrial & Scientific
Amazon.com: MakerFocus 20pcs 5V 650nm 5mW Red Dot Laser Head Red Laser Diode Laser Tube with Leads Head Outer Diameter 6mm : Industrial & Scientific
New High Power 850nm 1000mw 1W IR Infrared Laser Diode 5.6mm: Amazon.com: Industrial & Scientific