If you are looking to buy the smallest camera in the world, you would probably want to visit a specialty electronics store. The Japanese marketplace in New York is a good idea.
Amazon is a good place to start to find a refurbished Nikon camera online and they offer some very good prices for a refurbished Nikon camera online as well
Digital camera ratings can be found at places such as Whatcamera or Which. If there is a good independent camera shop nearby it is also worth going in there and asking their advice because they will be the experts.
Yes you can go to bestbuy.com or you can go to Canon.com or nikon.com. There a lot of website that will actually help you find the perfect camera for you.
The main difference between a digital camera and a regular camera is that a digital camera does not need film in order to work. The Canon A430 is inexpensive and a good starter digital camera. It's priced around $170 but will last you a long time.
A good place to find a digital camera made by Nikon would be Staples. They have tons of choices and I bet they have digital cameras made by Nikon. So go take a quick look.
a small size.
You can always install a small hidden surveillance camera at your house to find out if your wife/husband is cheating on you! xD
Instant cameras can be expensive but if you do your research right, you will be able to find some good quality camera and affordable. I think the best place to get an instant camera is at best buy or any electronic stores that carry them.
You can hide a camera in a car behind the license plate.
You can find a good used camera on crags list or on eBay both those websites have really good prices and I am sure you can find a great camera on there.
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you can find them in small stores at the mall like Spencers or in magazines.