Night vision: image intensifier tube

Ok well i am building a set of night vision goggles that utilizes Infrared light to see in the dark
what my layout is using about 10 200mw IR leds per eye piece so a total of 20 ir leds
now I've seen DIY night vision that works well but i want to fashion it into the normal style military night vision goggles. The only problem i am having is finding an image intensifier tube
so if any one of my fellow airsofters has one or know where to get one please let me know, im not looking for anything beyond gen 1, not looking to spend a lot of money on these. one article i read about his night vision was he found an image intensifier for about $27 so im looking for 2 identical ones.

Thanks

P.S if i get these built ill post the schematics here for all you to enjoy