No, film single lens reflex (SLR) cameras exist, albeit obsolete. Currently all commercial single lens reflex cameras are digital, however, it may be possible to find a retailer or more likely, a private seller in possession of a functional film SLR camera.
SLR digital cameras are professional grade cameras which have settings which may be manipulated to produce outstanding photos that otherwise could not be achieved with a regular digital camera
Digital SLR referes to "digital single-lens reflex." This terminology is often used when speaking about cameras. Such cameras can allow the photographer to change lenses as he or she sees fit.
All major camera companies make SLR cameras, as well as digital SLR cameras. My photography teacher always recommended the Promaster 2500PK Manual SLR camera for its ease of use, value, and manual functions.
Nikon
Currently, there are three major comparison sites for digital SLR cameras on the web. Those sites are Snapsort, What Digital Camera, and DP Review, which is probably the most comprehensive of the three.
canon and olympus are leaders in digital slr cameras and they have very wide range of lens options.
Most of the new cameras are equipped with SLR technology. Some are not still, but generally all of the newer models are. Canon and Sony have a lot of models with SLR technology.
The best brands for digital SLR cameras are: Epson, Canon, Casio, Axis, JVC, Java, Lenovo, Panasonic, Olympus, Medion, Nikon, Samsung, Sony, and Sanyo.
Not all digital SLR cameras have the ability to record videos with sound. In fact, most do not have that option. However, the new Canon Rebel TSi is the first of its kind, offering to shoot video, with sound, in high definition.
The difference is the lens, auto-focus, color and sharpness / detail of the picture, but this only depends on the two cameras that you are comparing.
There are many options for digital SLR cameras but the most popular company is Nikon. Nikon offers a range of cameras including moderately priced consumer models starting around $500 and professional cameras reaching upwards of $7000.
Digital SLR cameras tend to be the higher priced digital cameras. During some searches, I found prices for digital SLR ranging from $598 to $1,200. If you have a particular brand in mind, check with the manufacturer to see if they have refurbished units available. Refurbished unit have full warranty but usually are cheaper.