One can buy night vision goggles from most military surplus stores, as they are often targeted to entice civilians. Night vision goggles have many uses off the battlefield, including increased view for hunting and camping.
Night vision goggles can be purchased from military surplus stores or online at sites like Amazon.com and Ebay.com. For true military-grade goggles, one will have better luck going to a surplus store and speaking to the associates there about the goggles and what their intended use will be. Though surplus stores also sell to active-duty military personnel, they are open to the general public and sell most of their items to civilians.