<looks around> I've got a older Metrologic 1mW complete HeNe laser head w/integrated power supply.. Works good.. Also have a complete laser light show projector with integrated HeNe laser.. It's a cheapie commercial lissajous scanner but it works and completely self-contained.. The HeNe could come out and something else go in..
1980 Metrologic 2mW 632nm hard seal 110v with 500 hours. asking $210
key switch, threaded aperture, random polarized, 12'' long compete tube/PS module.
Good and strong as day I bought it new. paid $350
Never buy a laser with epoxied mirrors, they leak air in the tube.