$10 red he ne with p/s

Uniphase Helium Neon Gas Laser 1508-0 Novette He-Ne | eBay

if they work it's a great deal.....if not maybe you get a cheap power supply.

http://www.jdsu.com/ProductLiterature/schnl1500-ds-cl-ae.pdf

$18 with shipping

Do any AC-DC plugs of the right power fit? or do I need a special HE-NE plug?

Edit:asking about He:Ne lasers in general

I only have a single HeNe that doesn't either use an Alden connector or has an internal power supply and plugs directly into 110vac.

That one is from a very old super market scanner and the housing has Ben modified to take a standard walmart @ 9 - 12vdc.