Quarton Red Dot Tiny Laser Module VLM-650-22 LPA (Mini-Size: Dimensions- D4 x 15 mm, Glass Lens): Amazon.com: Industrial & Scientific
Amazon.com: Lights88 Laser Diode (5MW Green Laser) Green Laser Diode Module GM532-20 DC2.7-4.2V (Crosshair Shape) : Tools & Home Improvement
Quarton Direct Green Straight Line Laser Module VLM-520-55 LPO (Non-DPSS Green Line Laser Module: Operating Temperature Range : -4 °F ~ 140 °F): Amazon.com: Industrial & Scientific
Amazon.com: 450nm 20W Laser Module, 4W Optical Power Engraving Module, Adjustable Focal, Blue Laser Head for Laser Machine DIY Laser Engraver Wood Paper Leather