did you mean 8mm and 16mm FILM cameras ?
they are sold on eBoi and don't cost very much.
i have had and used bolex ( with switar lenses )
the b8, b8l, h8 and h16 cameras, and i had a lot of fun with them
if you google bolex, or 8mm or 16mm film
you will find a ton of info on those cameras
( i don't know much about the reveres or any of the other makers, sorry )
http://lavender.fortunecity.com/lavender/569/
is a huge directory for 8mm
http://www.paulivester.com/films/films.htm
16mm stuff
and bolex history here to help you ID a camera ..
http://www.bolexcollector.com/
you can still get film and get it processed
i always used
http://www.prepfilm.com
he sells 8mm ( super and double ) and 16mm and will have it processed for you as well,
he's a nice guy too
if it is a video camera you are asking about,
can't help you much there ...
you might be able to find VHS cameras for not too much money somewhere near you.
they tend to be VERY bulky, hold a tape either in the camera or in thing the camera
is cabled to and they weigh as much as a small child.
i was recently gifted one, it was beautiful but i donated it to a local art-metropolis ...
the bolex cameras are some of the best,
the cameras and lenses may be inexpensive these days but
it still costs a small fortune to feed'em ..
good luck!
john