One would purchase a camera detector mainly for reasons of security and privacy. A camera detector can be a useful tool in determining whether one is under the surveillance of an outside third party camera.
There are many places where one can purchase a counterfeit money detector. A good place is the website "Amazon" or the website "eBay" to purchase a money detector.
One can purchase a Minelab metal detector as a precious metals show and convention or online at Amazon or any metal detector website. Plus shipping of course.
You can purchase a moisture detector at your local Lowe's or Home Depot store. You can also purchase one online from the Amazon website and have it shipped directly to your house.
One can purchase an underwater metal detector at a local all round hobby store or at a metal detector store. One can also buy one on various webshops like Amazon or eBay.
Camera shop
There are many places where one can purchase a Nikonos camera. One may purchase a Nikonos camera from the Nikon website. One may also use reputable websites such as Amazon or eBay to purchase this camera.
One can purchase a camera card at local retailers such as Walmart, Target, Sears, AAFES, and the NEX. One can also purchase the camera card online at Amazon or eBay.
There are many places where one can purchase a Polaroid 600 camera. The camera can be easily bought at a local camera store or at a local electronics store.
The best place would be the manufacturer's site at Nikonusa. However, you could purchase a Nikon coolpix camera at Bestbuy, Target, Walmart and even at Amazon or Ebay.
One can purchase a laser photo-detector at Best Buy and other electronic store shops. They can also be found on eBay and Amazon for discounted prices.
Anymore you can purchase a digital camera at a reasonable price. Depending on what needs to be repaired on your camera you may be better off just getting a new one. I would suggest getting an estimate on how much it would cost to fix first and then weigh your options.
One can purchase such a camera from any photography shop in your nearest town/village but if one is looking for more convenience - all purpose stores such as Amazon would easily sell any type of camera from a range of sellers.