I'd like to enter what I call "Lazer's Phaser" heh hence the name
This build only cost me $40 so it's definitely on the cheaper side.
Airsoft Gun/Host (sporting goods store) - $20
50mW 532nm laser module (DealXtreme) - $16
2AA Battery Pack (ebay) - $2
Momentary Switch/Trigger (ebay) - $2
I wanted to do a unique build because I figured most would enter a typical host specifically designed for a module.
Fitting the module and batter pack into the host was fairly difficult with having to tear out all the contents and then making many cuts and adjustments to fit everything in. Also, the trigger was hard to establish within the gun as well.
This laser has respectable power, especially for being under $50. I chose a clear gun so the module was visible in the host and it gives it a more techy laser feel if that makes sense.
Overall, it feels pretty sweet owning a sort of phaser/laser gun and knowing that it was only $40.