Depends on what camera it is, doesn't it?
If it's rust on the terminals, can always just remove and replace the terminal contacts... unless it's battery-leak, and it's in the body, then you've got a problem.
Fungus on the lens: just send it in to any workshop, or the agent that distributes that lens.
since there is already fungus... try self cleaning ....
the battery terminals due to leak can be cleaned with vinegar... i hope... or filed.... take note of wiring also.... you may have to resolder if they come loose
As for fungus.... 1 part ammonia and 1 part hydogen peroxide...
Sorry, can't help you there, dunno anything about that camera's value. Why don't you check on the Nikon forum? Might be someone there who can help you.
At the same time, bring your camera down for a no-obligation assessment at some workshop or with the agent, then you'll be better able to gauge... lens cleaning might cost anything from $50 - $80 depending on what lens it is and how bad the condition.
Or what you can try is switching out terminals with replacements, or if it's some old camera, you might have to cannibalize...
just came back from peninsula.
None of the shops there want to fix this camera (Nikon F401x). :cry:
The lens kit which got some fungus cost about 65-80SGD to clean
Too bad i am a canon user, eventhough i clean it i can not use it.