How Do I Put On Night Vision Sony Im Wondering How Can Infinty Ward Afford To Put Night Vision Goggles In Modern Warfare 2.when Goggles Cost $$$?

Im wondering how can infinty ward afford to put night vision goggles in Modern warfare 2.when goggles Cost $$$? - how do i put on night vision sony

I mean, night vision devices can provide real cost anywhere from 1000 to 6000 $, how they do it for 150 too?