Some older optics have a tendency to grow fungus on the inside of the lenses. Taking scopes apart is not for the faint of heart, and often not cost effective to send them out for service, unless there is a lot of sentimental value tied to it.
A quick search on Ebay produced three or four scopes from $60-$100 range.
A quick search on Ebay produced three or four scopes from $60-$100 range.