Hi !
I want to buy a cheap (<80 dollars) astronomy laser and i have 18650 cells.
I have found this : Sharp High Power Green laser 200mW /Waterproof/focusable [OL-WG-200] - $136.99 : Zen Cart!, The Art of E-commerce
But i'm pretty sure there is the same on aliexpress :
gros lasers 2013...