In article <4j07oa$hp@dfw-ixnews1.ix.netcom.com>, ronellis@ix.netcom.com says...
>The back has broken on my F3. The rivets that hold the back and the
>hinge together snapped. [...]
>How can I get a regular old standard back - new or used?

Call 1-800-NIKON US, ask for the number of the parts department.
When there, ask for the price of the back (you may need the
leatherette pieces, also, and a pressure plate - unless you want to transfer your present one [it is simple]). Nikon parts are cheap,
though dealing with the parts dept. can be "interesting".....
Hope This Helps